Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Logitech - G309 Lightspeed | Logitech - G502 X PLUS |
|---|---|---|
| Battery | 300 h | 120 h |
| Weight | 68 g | 106 g |
| Buttons | 6 | 13 |
Between the G309 Lightspeed and G502 X PLUS, the G309 Lightspeed comes out ahead in battery / weight, while the G502 X PLUS wins on buttons. Overall, the G309 Lightspeed scores 63.1 and the G502 X PLUS scores 54 on our Mars Score.
Which should you buy?
The G309 Lightspeed is the clear pick on raw spec strength, leading by 9.1 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 battery, weight. The single most decisive one: Battery — 150.00% more. 300 h vs 120 h.
Pick the G502 X PLUS if you care most about buttons. Its strongest claims are buttons. The single most decisive one: Buttons — 7.00 more. 13 vs 6.
Both ship with comparable max dpi, polling rate, wireless, so those specs do not 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.
Which should you buy: Logitech - G309 Lightspeed or Logitech - G502 X PLUS?
Logitech - G309 Lightspeed leads the current Mars Score by 9.1 points.The more useful decision is the trade-off behind that result: compare 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 Logitech - G502 X PLUS if…
Logitech - G502 X PLUS has the measurable edge on 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 — 150.00% more. 300 h vs 120 h.
- ▲Weight — 38.00 g less. 68 vs 106.
Why Logitech - G502 X PLUS wins
- ▲Buttons — 7.00 more. 13 vs 6.
Spec comparison
Sensor
| Spec | Logitech - G309 Lightspeed | Logitech - G502 X PLUS |
|---|---|---|
| Max DPI | 25600 | 25600 |
| Max IPS | 400 | 400 |
| Polling rate | 1000 Hz | 1000 Hz |
Design
| Spec | Logitech - G309 Lightspeed | Logitech - G502 X PLUS |
|---|---|---|
| Weight | 68 glead | 106 g |
| Buttons | 6 | 13lead |
| Shape | Right-handed | Right-handed |
Connectivity
| Spec | Logitech - G309 Lightspeed | Logitech - G502 X PLUS |
|---|---|---|
| Wireless | true | true |
| Battery | 300 hlead | 120 h |