Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Logitech - G309 Lightspeed | Razer - Cobra Pro |
|---|---|---|
| Battery | 300 h | 170 h |
| Max DPI | 25600 | 30000 |
| Weight | 68 g | 77 g |
| Buttons | 6 | 10 |
Between the G309 Lightspeed and Cobra Pro, the G309 Lightspeed comes out ahead in battery / weight, while the Cobra Pro wins on max dpi / buttons. Overall, the G309 Lightspeed scores 63.1 and the Cobra Pro scores 61.5 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (63.1 vs 61.5). The decision is not about overall quality — both clear the bar — it is 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. The single most decisive one: Battery — 76.47% more. 300 h vs 170 h.
Pick the Cobra Pro if you care most about max dpi / buttons. Its strongest claims are max dpi, buttons. The single most decisive one: Max DPI — 17.19% more. 30000 vs 25600.
Both ship with comparable polling rate, wireless, 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: Logitech - G309 Lightspeed or Razer - Cobra Pro?
Logitech - G309 Lightspeed leads the current Mars Score by 1.6 points.The more useful decision is the trade-off behind that result: compare max dpi, weight against the way you will actually use the product.
Choose Logitech - G309 Lightspeed if…
Logitech - G309 Lightspeed has the measurable edge on battery h, weight g.
Choose Razer - Cobra Pro if…
Razer - Cobra Pro has the measurable edge on max dpi, button count.
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 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 |