Dell - Alienware m18 R2 vs Lenovo - Legion Pro 5i Gen 10
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Dell - Alienware m18 R2 | Lenovo - Legion Pro 5i Gen 10 |
|---|---|---|
| Refresh rate | 165 Hz | 240 Hz |
| Claimed battery life | 6 h | 8 h |
| Battery | 97 Wh | 80 Wh |
| Screen size | 18 " | 16 " |
| Weight | 4.13 kg | 2.5 kg |
Between the Alienware m18 R2 and Legion Pro 5i Gen 10, the Alienware m18 R2 comes out ahead in battery / screen size, while the Legion Pro 5i Gen 10 wins on refresh rate / claimed battery life. Overall, the Alienware m18 R2 scores 73.8 and the Legion Pro 5i Gen 10 scores 73.4 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (73.8 vs 73.4). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Alienware m18 R2 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are battery, screen size. The single most decisive one: Battery — 21.25% more. 97 Wh vs 80 Wh.
Pick the Legion Pro 5i Gen 10 if you care most about refresh rate / claimed battery life. Its strongest claims are refresh rate, claimed battery life, weight. The single most decisive one: Refresh rate — 45.45% more. 240 Hz vs 165 Hz.
Both ship with comparable ram, storage, cpu cores, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Dell - Alienware m18 R2 or Lenovo - Legion Pro 5i Gen 10?
Dell - Alienware m18 R2 leads the current Mars Score by 0.4 points.The more useful decision is the trade-off behind that result: compare screen size, weight, battery against the way you will actually use the product.
Choose Dell - Alienware m18 R2 if…
Dell - Alienware m18 R2 has the measurable edge on battery wh, screen size in.
Choose Lenovo - Legion Pro 5i Gen 10 if…
Lenovo - Legion Pro 5i Gen 10 has the measurable edge on refresh rate hz, claimed battery h, weight kg.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Dell - Alienware m18 R2 wins
- ▲Battery — 21.25% more. 97 Wh vs 80 Wh.
- ▲Screen size — 12.50% more. 18 " vs 16 ".
Why Lenovo - Legion Pro 5i Gen 10 wins
- ▲Refresh rate — 45.45% more. 240 Hz vs 165 Hz.
- ▲Claimed battery life — 33.33% more. 8 h vs 6 h.
- ▲Weight — 1.63 kg less. 2.5 vs 4.13.
Spec comparison
Design
| Spec | Dell - Alienware m18 R2 | Lenovo - Legion Pro 5i Gen 10 |
|---|---|---|
| Weight | 4.13 kg | 2.5 kglead |
| Thickness | 27.4 mm | 26 mmlead |
| Build material | magnesium-aluminum | aluminum |
| Backlit keyboard | true | true |
| Fingerprint reader | false | false |
Display
| Spec | Dell - Alienware m18 R2 | Lenovo - Legion Pro 5i Gen 10 |
|---|---|---|
| Screen size | 18 "lead | 16 " |
| Refresh rateⓘ | 165 Hz | 240 Hzlead |
| Panel typeⓘ | IPS | IPS |
Performance
| Spec | Dell - Alienware m18 R2 | Lenovo - Legion Pro 5i Gen 10 |
|---|---|---|
| CPU | Intel Core i9-14900HX | Intel Core Ultra 9 275HX |
| CPU cores | 24 | 24 |
| GPUⓘ | NVIDIA GeForce RTX 4080 Laptop | NVIDIA GeForce RTX 5070 Laptop |
| RAMⓘ | 32 GB | 32 GB |
| Storageⓘ | 1024 GB | 1024 GB |
| Storage typeⓘ | SSD | SSD |
Battery & Ports
| Spec | Dell - Alienware m18 R2 | Lenovo - Legion Pro 5i Gen 10 |
|---|---|---|
| Batteryⓘ | 97 Whlead | 80 Wh |
| Claimed battery life | 6 h | 8 hlead |
| USB-C portsⓘ | 2 | 2 |
| Thunderbolt portsⓘ | 1 | 1 |
| HDMI | true | true |
Frequently asked
Which has better battery life, Alienware m18 R2 or Legion Pro 5i Gen 10?+
Legion Pro 5i Gen 10 claims up to 8 hours — 6h vs 8h.
Which is lighter, Alienware m18 R2 or Legion Pro 5i Gen 10?+
Legion Pro 5i Gen 10 is lighter at 2.5 kg vs 4.13 kg.
Which has an OLED display, Alienware m18 R2 or Legion Pro 5i Gen 10?+
Neither model has an OLED display.