lenovo vs dell laptops

Dell vs Lenovo Laptops: Which Brand to Pick? Durability. Since Laptops and PCs are a long-term investment, people often durability as a fairly important factor. Price and Budget. If you are going to purchase a laptop, the first thing you think of is the budget. Depending on that, Design. Design In addition to traditional systems, Dell offers all-in-one desktops with integrated displays, low cost Chromebooks running Google's Chrome OS instead of Microsoft's Windows 10, and 2-in-1 laptops that convert into tablets. Dell also separates itself by offering more AMD CPU options than HP or Lenovo typically do, and by its well regarded Answer (1 of 15): I prefer ASUS, their quality is why they (for many years) supplied the motherboards for Intel workstations and servers. I have also worked for years with Dell laptops and find them to be great for work environments. I personally own a Lenovo and find it a little under powered fo Vay Tiền Online Chuyển Khoản Ngay. Dell is making a steady stream of announcements at Dell Technologies World in Las Vegas this week, including among them refreshed models of the company’s Latitude and Vostro notebook computers. Dell’s Latitude series and Lenovo’s ThinkPad series are popular options for business users due to the inclusion of several hardware and security features. TechRepublic compares the two product lineups to help you decide what’s best for you. The business case for Dell Latitude systems Dell’s newly-announced systems bring essentially the same set of features for business-class systems as are available from HP and Lenovo. Among these include aluminum and/or carbon fiber chassis, privacy screen settings to narrow the field of view, fingerprint readers, Windows Hello-compatible IR cameras, and smart card readers. The aluminum and carbon fiber Latitude 7000 series comprises 13- and 14-inch models, and 2-in-1 12-inch model Latitude 7200, while the carbon-fiber Latitude 5000 series includes 13-, 14-, and 15-inch models. The budget-focused Latitude 3000 uses the same form factors, without the carbon fiber reinforcement. All use 8th Gen Intel Core processors. The newly-announced models are available starting May 1, with the 7000 series starting at $1,299, the 2-in-1 Latitude 7200 starting at $999, the 5000 series starting at $819, and 3000 series starting at $599. Compared to Dell’s consumer-facing XPS series, the newest Latitude and Vostro models correctly place the webcam at the top center of the screen bezel, avoiding the “nose cam” effect. There is no cover for the webcam, however, leaving users who need to cover the camera reliant on tape or sticky notes, while Lenovo includes the “ThinkShutter” to cover the camera when not in use. SEE 16 top laptops for business users in 2019 free PDF TechRepublic If you’re working in particularly adverse conditions, Dell’s Latitude Rugged series provides a great deal more protection than is available on Lenovo’s ThinkPad line. While ThinkPads are by no means fragile more about that later, the Latitude Rugged 5420 is MIL-STD 810G and IP52 certified, and would serve well in environments where these systems are not likely to be handled gingerly. Dell’s Latitude Rugged and Rugged Extreme series are more in competition with Panasonic’s ToughBook series, as there is not quite a direct competitor in among ThinkPads. The business case for Lenovo ThinkPad systems Owing to a distinctive design language, the ThinkPad is practically synonymous with “business notebook,” though fans of IBM’s original models are often quick to criticize Lenovo’s stewardship of the brand. Twelve years after Lenovo’s purchase of the ThinkPad business from IBM, some changes have been made, though these typically reflect industry-wide changes in how laptops are designed. Among these include the use of 169 screens, which are often criticized for being designed for media consumption rather than productivity. Though Dell and HP systems use the same screen type, MacBooks use 1610 screens, while Microsoft’s Surface line of devices adopted 32 screens in 2014, similar to Google’s Pixelbook and Pixel Slate systems. Abandoning the seven-row keyboard with the exception of the ThinkPad 25th Anniversary Edition has also been a point of criticism. Dell and Lenovo business-class systems are on essentially equal footing for user serviceability, though the extent to which this is possible has decreased in recent years. The ThinkPad X390 has soldered RAM, as does the 2-in-1 version of the 2018 Dell Latitude 7390, though the standard notebook version of the 7390 has soldered RAM and one SODIMM slot. Dell’s model number schema leaves a lot to be desired. For comparison, recent 13-inch HP notebooks including the EliteBook 735 and EliteBook 830 G5 include two SODIMM sockets. Soldered RAM makes it impossible to upgrade after ordering, and leaves buyers captive to manufacturer’s pricing for RAM, which can often be exorbitant. While this is slightly more forgivable on a 13-inch system, the soldered RAM + single SODIMM combination on the 15-inch T590 is objectionable. SEE Beyond the PC Lenovo’s ambitious plan for the future of computing cover story PDF TechRepublic Thankfully, Lenovo does offer the P-series mobile workstation with superior serviceability, with the P52 and P72 including 4 SODIMM slots, 2 2280 SSD slots, and a single SATA drive. This expandability does come the cost of weight, as the P52 weighs in at kg pounds. While this is heavy relative to contemporary systems, it is lighter than older systems with similar expandability-the T510, for example, weighs in at kg pounds. The verdict If you want to make a judgement by sales alone, Lenovo shipped just over 3 million more systems worldwide than Dell did for Q1 2019, giving the company a 23% market share compared to Dell’s according to IDC. Lenovo and Dell-which are ranked 2nd and 3rd, respectively-are the only companies to have year-over-year growth in Q1, while HP Inc., in first place with market share, fell by Sales are not everything, however, and the bandwagon effect is not a precisely useful metric. Linux users are equally well-served by both Latitude and ThinkPad systems, as both officially support Linux, and are among the more popular notebooks among Linux developers. For users needing expandability, Lenovo’s P-series is a likely best bet, though for rugged use cases, Dell’s Latitude Rugged series is a better fit. Modern day Dell systems should not be judged by the company’s past faults, while Lenovo’s ThinkPads do not live in the shadow of IBM. Essentially, the differences come down to aesthetics and pricing. If you see one you like, and can grab it in a sale, go for it. When you want to invest in a new laptop, you have quite a many choices in front of you. Though the process of choosing one might not be overwhelming as the task of building a whole PC, laptops significantly differ between them which you will have to research in detail to guide your decision. If you are looking for the best quality laptops working on Windows, the two main brands that will flash in your mind are Lenovo and Dell. These two manufacturers are known for flooding the market with high end premium laptop models. Nevertheless, the devices they manufacture are quite different in their characteristics. For a broader understanding, we may say that Dell laptops have higher specifications and features, but they do carry a higher price. At the same time, you must bear in mind that higher prices do not always guarantee a higher quality. Each laptop brands has its own pros and cons to take into account. There are some good models from each manufacturer that can meet your expectations. Here I have compared these two brands on some basic parameters to guide anyone’s decision of choosing the right laptop brand. Lenovo Vs Dell When you have to choose between Lenovo and Dell, you may go by the understanding that Dell makes higher quality laptops. A representative example of Dell’s offerings is Dell’s XPS series. Lenovo can be a good choice if you are contemplating on investing in a well-priced laptop. Nevertheless, this general rule does not apply to Lenovo’s ThinkPad series as they try to compete with the top quality offerings seen in the market with their high-end specifications and bigger price tags. Looking at the bottom line, both Lenovo and Dell make amazing laptops. However, you will need to take into account a few things while trying to choose between Lenovo and Dell. Dell Laptops Overview In general terms, Dell laptops are priced on the higher side, but their quality is indisputable and promising. Best suited for high-end gaming, less strenuous activities and demanding work, Dell’s laptops exist on a different platform. Dell’s laptops can be depended on for heavy use. At the same time, its models like Chromebook are targeted for light use. When it is the question of performance, Dell’s high-end models come with amazing processors and graphics cards. Such components can compete with high-end gaming PCs when you want really them to. In addition to gaming, they can also support editing high quality photos and videos. When you do not want something with so much power, you can settle with Dell’s Chromebooks. These are rendered as lighter models that can best suit travels. Nevertheless, they too feature decent processors that can deliver more power when compared with the laptops of similar size range from other brands. Most Dell laptops are fitted with high-end screens. In general, they implement HDR, which is a great choice for portable screens. Even with a heavy use, they can assure seamless performance for about 6 hours. Though this might not be a good thing when compared with some others you can find in the market today, this is a good number to touch taking into account their power. If you are willing to spend more on them, Dell laptops are the best options. Especially when you want a laptop with the power comparable to a full-fledged desktop PC, it is better that you settle with Dell. Pros Dell’s laptops are configured with internal parts and design that are comparable to the best industry standards. Other than Apple, Dell is known for some of the best screen builds and displays found in the market. Dell’s customer service is rated above average among all the brands out there in the market. Given the strong concerns raised about the poor customer services of several popular computer companies, this is a great news for those who wish to invest in Dell laptops. Cons Some models offered by Dell over the recent years are diagnosed with poor battery life. If you are looking forward to using the computers on the go, this is an important concern you must give attention to. Despite their several merits and advantages, many people share the notion that Dell laptops are priced more than what they actually deserve. The best of Dell – The XPS Series The widest known laptop series from Dell is the XPS series. Though all the different models of this series are pretty expensive, we can say they are quality built offerings. The model names XPS 13 and the XPS 15 actually depict their screen size in their labels. XPS 17 is the largest members in this series which is not a gaming laptop. However, it is made to match with the same quality build. Expert reviews opine that XPS series has some of the best built laptop models of our times, evident in their finest audio quality and display characteristics. In addition, their excellent engineering has rendered them so very well with a comfortable and highly responsive keyboard, high performance, strong battery life and aesthetic appearance. The most attractive laptops you will find today, they have a matchless design. The several alluring advantages of the XPS series make them some of the best options you can land on today. Lenovo Laptops Overview Lenovo laptops are among the top selling laptop models today. Some of the most desirable characteristics of Lenovo laptops are their admirable quality, versatile nature, and their reasonable and affordable pricing. When it comes to pricing, Lenovo laptops generally occupy the lower end of the scale. Nevertheless, they are known to give the best value for your investment. Rendered with a sturdy body and durable features, they can last for long withstanding different kinds of stresses. In the segment of value laptops, Lenovo’s contribution in number of models is noteworthy. If you have some serious concerns with regard to the budget you allot for your laptop, probably you will find Lenovo can be the right choice. In terms of their performance, Lenovo laptop models do not lag anywhere behind those of the leading brands. Majority of Lenovo laptops are powered by Intel Processors. These processors can easily support and handle anything you throw at them from high end gaming to top quality video. It might not be feasible to run first-person shooters at 240 frames per second on these models, buy playing a game or watching something will never be a struggle on Lenovo laptops. The economically priced models of Lenovo do not have the same kind of advantages that the higher end models can boast of. What is important to note about Lenovo laptops is that they are certainly going to promise you the performance on par with your investment. When you are awaken to the reality that top performing laptops of most other brands are invariably priced on the higher side, you will only be happy that Lenovo can bring you all those advantages at a cheaper price. For casual use, Lenovo is undoubtedly a great choice. For light use, most Lenovo models are well built and stylishly designed. If you are willing to stretch your budget a bit more, you can land on some good models that bring you a better performance. If you plan to do things that will not be too taxing on your laptop, you will find Lenovo promise you the best value for your money. Pros When we talk about the best value for money, Lenovo is certainly the winner since majority of its offerings carry a reasonable and cheaper price tags. Most of their lower end models like IdeaPad for instance are available at reasonable prices online and offline. While belonging to the lower price spectrum of laptops, their configuration is never disappointing as Lenovo has made use of Intel processors and Nvidia of Lenovo’s models are stylistic and simplistic options and for this reason, Lenovo has a huge following. Cons Majority of Lenovo’s laptop offerings belong to the lower end models when compared to those of Dell. Therefore, when it comes to choosing from the premium laptop range, there is no much option. Most of Lenovo’s laptops are not designed for gaming. Legion is the only series that exclusively targets to fulfill the needs of gamers. However, the gaming characteristics of this series is not up to the mark. The best of Lenovo – The Thinkpad Series When we say XPS is the best of Dell, we need to project Lenovo’s Thinkpad series as the best of Lenovo. Thinkpad models of Lenovo are among the bestselling models over the last few years. Though Lenovo has conceived this series primarily targeting business class users, the members of this series are quite popular among other professional circles too. Among the galaxy of models delivered by Lenovo, the X1 Carbon is perhaps the most representative model that has a huge following. This model has a long list of admirable features you will expect in a good laptop including sleek design, highly reliable internal components, and an excellent display that will all together make this model a hard to beat option. Take home from this discussion Looking at the top characteristics, pros and cons of these two major computer brands, it becomes pretty clear when it comes to making a choice. When it comes to durability and supporting highly demanding programs and tasks, Dell’s laptops are indisputably recommended. Nevertheless, they bring all of these advantages for a higher price. If a larger spend in never a constraint for you, Dell laptops can be the best option or you. While comparing between Lenovo and Dell, price is certainly one of the most important points of study. Lenovo delivers some of the best quality devices with a focus on value. Finding better laptop models than those of Lenovo in the same price range is nearly impossible. Lenovo laptops models are ideal for casual use, entertainment and general gaming. If you are looking for a laptop that assures the best value, you will find Lenovo the best brand you can invest in. Best Lenovo Desktops Best Lenovo Business Laptops Best Lenovo Gaming Laptops Tim Blue Tim is the main author of He loves buying new products, testing them out and sharing underrated products to the world. He's all about the underdog! Dell's XPS 15 9520 is a powerhouse 15-inch laptop with premium design and features. It costs quite a bit less than the X1 Extreme Gen 5, but it's not as durable and doesn't have the same high-end performance hardware options you'll find in the ThinkPad. If you want a svelte Ultrabook built for power users, this is it. For12th Gen Intel Core H-Series CPUsDual PCIe SSD slotsBeautiful display options, including OLEDMuch more affordableOutstanding audioAgainstTops out at an RTX 3050 Ti Laptop GPUFewer portsNo 4G LTE/5GFewer security options Lenovo ThinkPad X1 Extreme Gen 5 Lenovo's new ThinkPad X1 Extreme Gen 5 is available with up to a Core i9-12900H CPU and NVIDIA RTX 3080 Ti Laptop GPU. It's not as svelte as the XPS 15, but it's more durable, it has more ports, and has its own share of high-end features. If you need a business workstation on the go, this is it. For12th Gen Intel Core H-Series CPUsDual PCIe SSD slotsUp to a NVIDIA RTX 3080 Ti Laptop GPUOptional 5GPlenty of durability and securityAgainstVery expensiveTrackPoint eats up touchpad space Dell's latest XPS 15 9520 is mostly a continuation of the design that we first saw in the 9500 model, and it's still one of the best Dell laptops out there. Executive Editor Daniel Rubino said in his XPS 15 9500 review that it was a "near-perfect relaunch of the iconic powerhouse laptop," and that is still true today. It's a svelte 15-inch Ultrabook made of aluminum with carbon fiber accents; it starts at a slightly lower weight than the ThinkPad X1 Extreme and it has a smaller footprint, mostly owing to the fact that Lenovo's laptop made the jump to 16 inches last generation. The XPS 15 9520 received primarily a performance upgrade this time around, with new 12th Gen Intel Core H-Series processors, DDR5 RAM, and PCIe storage. The ThinkPad X1 Extreme Gen 5 received similar upgrades, with Intel's 12th Gen H-series CPUs, up to a NVIDIA RTX 3080 Ti Laptop GPU, DDR5 RAM, dual PCIe storage slots, and a new FHD+ display option. It's one of the best Lenovo laptops for anyone who wants performance, a slim profile, and extra durability and a look at all the specifications that make up these to scroll horizontallyHeader Cell - Column 0 Dell XPS 15 9520Lenovo ThinkPad X1 Extreme Gen 5OSWindows 11 HomeWindows 11 Pro, Windows 11 Home, LinuxProcessor12th Gen Intel H-Series12th Gen Intel H-SeriesRow 2 - Cell 0 Core i5-12500H, Core i7-12700H, Core i9-12900HKCore i7-12700H, Core i7-12800H, Core i9-12900HRAM8GB, 16GB, 32GB, 64GB16GB, 32GB, 64GBRow 4 - Cell 0 DDR5-4800MHzDDR5-4800MHzGraphicsIntel Iris Xe, Intel UHDIntel Iris XeRow 6 - Cell 0 NVIDIA RTX 3050, RTX 3050 Ti Laptop GPUsNVIDIA RTX 3050 Ti, RTX 3060, RTX 3070 Ti, RTX 3080 Ti Laptop GPUsStorage512GB, 1TB, 2TB PCIe NVMe SSD512GB, 1TB, 2TB, 4TB PCIe NVMe inches, 1610 aspect ratio, Dolby Vision16 inches, 1610 aspect ratioRow 9 - Cell 0 1920x1200 FHD+, non-touch, anti-glare, 500 nits, 100% sRGB1920x1200 FHD+, non-touch, anti-glare, 300 nits, 100% sRGBRow 10 - Cell 0 3456x2160 OLED, touch, anti-reflective, 400 nits, 100% DCI-P32560x1600 QHD+, non-touch, anti-glare, 500 nits, 100% sRGB, 165Hz, TÜV Low Blue LightRow 11 - Cell 0 3840x2400 UHD+, touch, anti-reflective, 500 nits, 100% AdobeRGB3840x2400 UHD+, non-touch, anti-glare, 600 nits, 100% AdobeRGB, Dolby Vision, HDR 400, TÜV Low Blue LightRow 12 - Cell 0 Row 12 - Cell 1 3840x2400 UHD+, touch, anti-reflective, 600 nits, 100% AdobeRGB, Dolby Vision, HDR 400, TÜV Low Blue LightPortsTwo Thunderbolt 4, USB-C Gen 2, audio, SD card readerTwo Thunderbolt 4, two USB-A Gen 1, HDMI, SD card reader, audioAudioDual woofers, dual tweetersDual 2W speakers, Dolby Audio, Dolby VoiceWirelessIntel Killer Wi-Fi 6 AX1675, Bluetooth Wi-Fi 6E AX211, Bluetooth 5G optionalCamera720p, IRFHD and IR hybrid, privacy shutterSecurityFingerprint reader, IR cameradTPM Nano lock slot, fingerprint reader, IR camera, Glance, x x x x inchesRow 20 - Cell 0 x 230mm x x x pounds pounds and featuresWhy you can trust Windows Central Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test.Image credit Windows CentralThe ThinkPad X1 Extreme Gen 5 uses basically the same design as its Gen 4 predecessor. A deeper body has space for the larger 16-inch display, using aluminum alloy for the base and a carbon fiber hybrid for the lid. Despite its larger footprint, it weighs almost the same at the XPS 15 9520 and is actually just a bit thinner. In my X1 Extreme Gen 4 review I mention that "the laptop is rigid, it's built well, and it has undergone the usual MIL-STD 810H mil-spec durability test to prove it can put up with harsh conditions." That holds true here for the fifth XPS 15 is made up primarily of aluminum, which adds to the weight. It's a truly solid laptop without flex or creaks, and it certainly doesn't feel cheap. However, it likely won't stand up to a life in the field as well as the ThinkPad. It's much better suited for an office, lecture hall, or to have around the laptops have top-firing speakers that flank the keyboard. The XPS 15 takes things a step further, adding two more speakers on the underside of the chassis. The result is a truly impressive listening experience. The X1 Extreme's speakers offer Dolby Atmos for spatial audio.Image credit Windows CentralCameras are installed above the display in each PC, though here the ThinkPad wins out with an FHD and IR hybrid camera for clear video conferencing and added security. The ThinkPad also has a physical camera shutter. The XPS 15 sticks with a 720p camera with IR for Windows laptops have a sizable Precision touchpad, though the TrackPoint system the red nub and physical buttons eats up some space on the X1 Extreme. The ThinkPad's keyboard offers comfy cupped keys, key travel, and dedicated navigation keys. The XPS 15's keys have slightly shallower travel, though it's still quite comfortable during long days of selection is firmly in favor of the ThinkPad. It has dual Thunderbolt 4, dual USB-A Gen 1, HDMI a UHS-II SD card reader, audio jack, and an optional Nano SIM slot if you decide to add 5G connectivity. The XPS 15's ports have been pared down to dual Thunderbolt 4, USB-C Gen 2, UHS-II SD card reader, and a audio jack.Image credit Windows CentralThe X1 Extreme has an Intel AX211 Wi-Fi 6E module inside, allowing it to access the 6GHz band on compatible routers. While the XPS 15 technically has the proper WLAN module for Wi-Fi 6E, it is stuck with standard Wi-Fi 6 due seemingly to a decision by Dell. This isn't a huge deal right now for a lot of people, but it will become more important in the near future. The X1 Extreme can also be equipped with 5G connectivity if you need to stay connected outside of Wi-Fi is an important part of every ThinkPad system. The X1 Extreme Gen 5 comes equipped with a Kensington Nano lock slot, fingerprint reader, IR camera, camera shutter, dTPM chip, Mirametrix Glance a fancy name for human presence detection, and it's Tile-ready to find your laptop if it's misplaced. The Core i7-12800H is also vPro-enabled, making it easier to manage with Enterprise XPS 15 9520 does have its own share of security measures, including a fingerprint reader and IR camera. It's enough for a lot of people, but those working with sensitive data might want to opt for the ThinkPad instead. You can grab the XPS 15 in Platinum Silver or Frost colors, while the X1 Extreme is only available in the standard ThinkPad Black X1 Extreme Gen 4 Image credit Windows CentralDell's XPS 15 9520 is available with three different displays, all sized at inches with a 1610 aspect ratio and Dolby Vision. The "basic" option has a 1920x1200 FHD+ resolution, 60Hz refresh rate, anti-glare finish, 100% sRGB color, and 500 nits brightness. Next up is a 3456x2160 OLED touch display with HDR 500, 400 nits brightness, 100% DCI-P3 color, and anti-reflective finish. Finally, there's a 3840x2400 UHD+ touch display with 500 nits brightness, 100% AdobeRGB color, and anti-reflective X1 Extreme Gen 5 has four different 16-inch display options from which to choose, all with a 1610 aspect ratio. The most affordable has an FHD+ resolution, 300 nits brightness, anti-glare finish, and 100% sRGB color. Next up is a 2560x1600 QHD+ resolution with 500 nits brightness, anti-glare finish, 100% sRGB color, 165Hz refresh rate, and TÜV Low Blue Light. The two UHD+ displays are priciest, but they will deliver the best picture. One has 600 nits brightness, an anti-glare finish, 100% AdobeRGB color, Dolby Vision, HDR 400, and TÜV Low Blue Light. The other is essentially the same, though it's touch-enabled and has an anti-reflective finish. It can also be used with the Lenovo Precision Pen 2 if you'd like to do some and pricingThinkPad X1 Extreme Gen 4 Image credit Windows CentralThe XPS 15 9520 is considered quite powerful for a 15-inch Ultrabook owing to its 12th Gen Intel Core H-Series CPUs and discrete NVIDIA RTX 3050 Ti Laptop GPU. You can get it with up to a Core i9-12900HK chip, 64GB of dual-channel DDR5 RAM, and up to 4TB of PCIe NVMe SSD spread out over two are also plenty of lesser configuration options. Prices start at about $1,420 for a model with Core i5-12500H CPU, Intel UHD graphics, 8GB of RAM, 512GB SSD, and FHD+ display. The ThinkPad X1 Extreme Gen 5 lives up to its name, offering high-end performance hardware that can handle specialized work. It can be had with up to a Core i9-12900H CPU, NVIDIA RTX 3080 Ti Laptop GPU, 4TB of PCIe NVMe SSD storage spread out over two slots, and up to 64GB of DDR5 dual-channel RAM. The discrete GPU options are what really propel the X1 Extreme ahead of the XPS 15. If you don't need the massive performance from the RTX 3080 Ti, you can also choose from RTX 3070 Ti, RTX 3060, and RTX 3050 Ti Laptop GPU options. Prices currently start at about $2,190 for an X1 Extreme with Core i7-12700H CPU, NVIDIA RTX 3060 Laptop GPU, 512GB SSD, 16GB of RAM, and FHD+ display. Dell's XPS 15 might not have the same high-end performance and security options, but it's a sleek Ultrabook that can hold its own thanks to a discrete RTX 3050 Ti GPU and Core i9-12900HK CPU. It's built extremely well, it has outstanding audio and display options, and you can get it for a lot less money than the X1 Extreme. Lenovo ThinkPad Extreme Gen 5 Not everyone needs an X1 Extreme, and indeed the price reflects the features and performance. If you want a ton of security, extra durability, lots of ports, and the utmost performance, it's the way to go. Just be prepared to pay. All the latest news, reviews, and guides for Windows and Xbox diehards. Cale Hunt is formerly a Senior Editor at Windows Central. He focuses mainly on laptop reviews, news, and accessory coverage. He's been reviewing laptops and accessories full-time since 2016, with hundreds of reviews published for Windows Central. He is an avid PC gamer and multi-platform user, and spends most of his time either tinkering with or writing about tech.

lenovo vs dell laptops