If your focus is on high-end gaming or intensive tasks like 3D rendering, the ASUS ROG Zephyrus G15 with its more powerful processor and graphics card will excel, but it is heavier and costs more. The Lenovo Legion Slim 5 is more affordable and has a sleeker design, which might appeal if portability and price are more important to you than top-tier gaming performance. Both laptops offer good battery life, but the ASUS slightly edges out the Lenovo. Consider the Lenovo for daily use and casual gaming, and the ASUS if you need a machine for more demanding applications and are willing to invest more. Give Feedback
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Advantages of the ASUS ROG Zephyrus G15
Very good for content creation
Very good overall build quality
Good portability
Best in class speakers
Advantages of the Lenovo Legion Slim 5
Very good keyboard
Key differences
Content Creation
8.0/10
7.5/10
7.5/10
OVERALL CPU SCORE
8.3/10
2560 x 1440
RESOLUTION
1920 x 1200
16.0 GB
RAM
16.0 GB
IPS
DISPLAY TECHNOLOGY
IPS
The ASUS ROG Zephyrus G15 is very good for content creation, while the Lenovo Legion Slim 5 is good.
PerfectRec’s Content Creation Score takes into account the many different features of the laptop that make it more or less suitable for photo editing, video editing and other content creation tasks.
Screen Quality
7.9/10
7.2/10
15.6in
SIZE
16.0in
2560 x 1440
RESOLUTION
1920 x 1200
IPS
DISPLAY TECHNOLOGY
IPS
165Hz
REFRESH RATE
144Hz
309.0 nits
BRIGHTNESS
300.0 nits
The ASUS ROG Zephyrus G15 has a better screen than the Lenovo Legion Slim 5 for general use, gaming and AI, engineering and design, and content creation.
For general use, where clarity, detail, and comfort over long periods are key, the ASUS's superior resolution and brightness provide a vivid and crisp display, while the Lenovo, though slightly less impressive on these fronts, still offers a clear and usable screen. In engineering and design tasks, accurate color representation is critical, and the ASUS excels with a broader color gamut, giving professionals an edge in precision; the Lenovo, while good, doesn't quite match up in color accuracy. However, when it comes to gaming and 3D applications, the lower refresh rate of both the ASUS and the Lenovo screens may not satisfy users looking for the smoothest visual experience, despite their acceptable resolutions and panel types.
Battery
9.5 Hours
7.0 Hours
The ASUS ROG Zephyrus G15 has 9.5 hours of battery life. The Lenovo Legion Slim 5 has 7 hours of battery life.
Battery life estimate is based on a mix of common use patterns. More portable and higher performing laptops tend to have less battery life.
Portability
Good
Fair
15.6in
SIZE
16.0in
4.1 lbs
WEIGHT
5.2 lbs
0.7in
THICKNESS
0.9in
The ASUS ROG Zephyrus G15 has good portability, while the Lenovo Legion Slim 5 has only fair portability.
The most portable laptops are small, thin, and light.
Build Quality
8.5/10
7.4/10
The ASUS ROG Zephyrus G15 has very good build quality, while the Lenovo Legion Slim 5 has good build quality.
PerfectRec’s Build Quality Score incorporates case materials, display and keyboard flex, hinge quality, and overall reliability.
Cost
$1,637
$1,000
$500
$1,000
$1,500
$2,000
$2,500
The ASUS ROG Zephyrus G15 has a price of $1,637 and the Lenovo Legion Slim 5 costs $1,000.
The ASUS ROG Zephyrus G15 and Lenovo Legion Slim 5 are both good for general use.
PerfectRec’s General Use Score takes into account the many different features of the laptop that make it more or less suitable for general productivity, web browsing, streaming, video calls, and running a wide variety of apps and programs.
Gaming and AI
7.5/10
7.7/10
7.4/10
OVERALL GPU SCORE
8.4/10
2560 x 1440
RESOLUTION
1920 x 1200
165Hz
REFRESH RATE
144Hz
Yes
SUPPORTS DLSS
Yes
No
MUX SWITCH / ADVANCED OPTIMUS
Yes
6.5/10
FAN NOISE SCORE
6.5/10
The Lenovo Legion Slim 5 and ASUS ROG Zephyrus G15 are both good for gaming and AI.
The ASUS ROG Zephyrus G15 is equipped with a Nvidia RTX 3070 GPU and a high screen refresh rate of 165Hz, making it exceptional for gaming and 3D applications, while the Lenovo Legion Slim 5 includes a newer Nvidia RTX 4060 GPU and a 144Hz screen refresh rate, also positioning it as a solid choice for similar tasks. Although both have powerful CPUs and high-quality IPS screens, the Zephyrus G15 offers higher resolution which can contribute to a more immersive gaming experience, but the Legion Slim 5 is a more recent model potentially with up-to-date features.
Engineering and Design
8.0/10
8.0/10
7.5/10
OVERALL CPU SCORE
8.3/10
7.4/10
OVERALL GPU SCORE
8.4/10
16.0 GB
RAM
16.0 GB
The ASUS ROG Zephyrus G15 and Lenovo Legion Slim 5 are both very good for engineering and design.
The ASUS ROG Zephyrus G15 is equipped with a high-end AMD Ryzen 9 CPU and Nvidia RTX 3070 GPU, along with a high-resolution screen which makes it excellent for demanding engineering and design tasks. On the other hand, the Lenovo Legion Slim 5 also provides ample computing power through its AMD Ryzen 5 CPU and Nvidia RTX 4060 GPU, but with a screen better suited for portability and still offering high-quality visuals, making it a reliable choice for engineering and design professionals who prioritize mobility without compromising too much on performance.
Software Development
7.4/10
7.4/10
7.5/10
OVERALL CPU SCORE
8.3/10
16.0 GB
RAM
16.0 GB
2560 x 1440
RESOLUTION
1920 x 1200
6.5/10
KEYBOARD QUALITY SCORE
8.5/10
The Lenovo Legion Slim 5 and ASUS ROG Zephyrus G15 are both good for software development.
PerfectRec’s Software Development Score takes into account the many different features of the laptop that make it more or less suitable for software developers.
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How the ASUS ROG Zephyrus G15 and the Lenovo Legion Slim 5 compare to other laptops
"As long as you're aware of the fact that the GeForce RTX 3080 laptop version can only unfold its potential to a limited extent due to Asus's low TDP setting and that it can be slower than a fast RTX 3070 laptop, the ROG Zephyrus G15 GA503Q cuts a fine figure. One of the biggest highlights turns out to be the WQHD panel, since it attracts customers with 165 Hz, relatively fast response times, FreeSync, and good color-space coverage. Other selling points are the surprisingly rich sound, the long battery life, and the sleek design. In terms of looks, the white edition stands out nicely from the competition."
"The Lenovo Legion Slim 5 Gen 8 acknowledges that a gaming laptop doesn’t have to be as thick as possible and can still ensure adequate cooling when the muscles need flexing. To this end, in the Slim 5 Gen 8, it finds a neat balance of refined, trimmed-down design that still lets its internals cruise (even above their max power ratings). Lenovo then added in some high-end build quality with an altogether excellent keyboard that’s useful for both work and play."
Get a great deal on the ASUS ROG Zephyrus G15 or the Lenovo Legion Slim 5
About ASUS
ASUS, a Taiwanese electronics brand, is one of the largest personal computer vendor by market share. The majority of their laptops are targeted towards personal use or gaming. Their most popular product lines include the budget-friendly VivoBook, more premium ZenBook, and their TUF and ROG gaming laptops, the latter of which has a reputation for excellent gaming performance.
About Lenovo
Lenovo is a Chinese technology company, and one of the largest personal computer vendor. They are well known for a variety of technology products, including laptops. Their consumer series include their entry level IdeaPad and LOQ series and mid-to-high-end Yoga and Legion series. On the business-oriented side, their series include their entry-level ThinkBook series and mid-to-high-end ThinkPad series. Lenovo laptops offer strong performance for reasonable prices, and are often on sale.
This information was produced and vetted by the PerfectRec laptops team. We are a product research and recommendation organization that meticulously reviews and evaluates the latest laptop information and makes it digestible for you.
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