Between the G309 Lightspeed and Cobra Pro, the G309 Lightspeed comes out ahead in battery and weight, while the Cobra Pro wins on max dpi and buttons. Overall, the G309 Lightspeed scores 68.2 and the Cobra Pro scores 67.4 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (68.2 vs 67.4). The decision isn't about overall quality — both clear the bar — it's about which specific trade-offs fit your use.
Pick the G309 Lightspeed if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are battery, weight.
Pick the Cobra Pro if you care most about max dpi and buttons. Its strongest claims are max dpi, buttons.
Both ship with comparable polling rate, wireless, so those specs don't 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 tells you both are well-rounded; the differences are about trade-offs, not quality.
Why Logitech - G309 Lightspeed wins
- ▲Battery — 76.47% more. 300 h vs 170 h.
- ▲Weight — 9.00 g less. 68 vs 77.
Why Razer - Cobra Pro wins
- ▲Max DPI — 17.19% more. 30000 vs 25600.
- ▲Buttons — 4.00 more. 10 vs 6.
Spec comparison
Sensor
| Spec | Logitech - G309 Lightspeed | Razer - Cobra Pro |
|---|---|---|
| Max DPI | 25600 | 30000lead |
| Max IPS | 400 | 750lead |
| Polling rate | 1000 Hz | 1000 Hz |
Design
| Spec | Logitech - G309 Lightspeed | Razer - Cobra Pro |
|---|---|---|
| Weight | 68 glead | 77 g |
| Buttons | 6 | 10lead |
| Shape | Right-handed | Symmetrical |
Connectivity
| Spec | Logitech - G309 Lightspeed | Razer - Cobra Pro |
|---|---|---|
| Wireless | true | true |
| Battery | 300 hlead | 170 h |
Spec-level deep dives
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