Between the G309 Lightspeed and EC3-CW, the G309 Lightspeed comes out ahead in max dpi and battery, while the EC3-CW wins on several specs. Overall, the G309 Lightspeed scores 68.2 and the EC3-CW scores 55.2 on our Mars Score.
Which should you buy?
The G309 Lightspeed is the clear pick on raw spec strength, leading by 13.0 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
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 max dpi, battery, weight, among others.
The EC3-CW similarly doesn't carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable polling rate, wireless, so those specs don't separate the two — focus on the differences below.
Bottom line: the G309 Lightspeed is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Logitech - G309 Lightspeed wins
- ▲Max DPI — 700.00% more. 25600 vs 3200.
- ▲Battery — 328.57% more. 300 h vs 70 h.
- ▲Weight — 7.00 g less. 68 vs 75.
- ▲Buttons — 1.00 more. 6 vs 5.
Why BenQ - EC3-CW wins
- No decisive advantages.
Spec comparison
Sensor
| Spec | Logitech - G309 Lightspeed | BenQ - EC3-CW |
|---|---|---|
| Max DPI | 25600lead | 3200 |
| Max IPS | 400 | 650lead |
| Polling rate | 1000 Hz | 1000 Hz |
Design
| Spec | Logitech - G309 Lightspeed | BenQ - EC3-CW |
|---|---|---|
| Weight | 68 glead | 75 g |
| Buttons | 6lead | 5 |
| Shape | Right-handed | Right-handed |
Connectivity
| Spec | Logitech - G309 Lightspeed | BenQ - EC3-CW |
|---|---|---|
| Wireless | true | true |
| Battery | 300 hlead | 70 h |
Frequently asked
Spec-level deep dives
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