Corsair - M75 Air Wireless vs Logitech - G309 Lightspeed

The M75 Air Wireless edges ahead on the Mars Score (72.5 vs 68.2), but the 4.3-point gap is small enough that the right pick comes down to which spec advantages matter to you.

Pick the M75 Air Wireless if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are polling rate, weight, max dpi.

Pick the G309 Lightspeed if you care most about battery. Its strongest claims are battery.

Both ship with comparable wireless, buttons, 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.