Both mice have excellent optical sensors, but the Hero sensor that the G502 Lightspeed is fitted with is more accurate than the G903 Lightspeed's by a small, but noticeable margin. When we take a look at performance, though, it becomes clear that the Logitech G502 Lightspeed is the clear winner in that department. Both mice are also compatible with Logitech's PowerPlay mat that will wirelessly charge them during play, effectively giving you infinite battery life. This is great if you like to fine-tune the weight of your mouse.

One advantage that the G502 Lightspeed has, though, is that it has more possible weight combinations than the G903 Lightspeed thanks to its greater variety and number of removable weights. It's worth highlighting that the Logitech G903 Lightspeed was designed with an ambidextrous shape, which means that it works well for both right and left-handed users the Logitech G502 Lightspeed is only meant for the right-handed. Both mice are built to last with sturdy frames and materials, and both come with 11 buttons that you can customize as in-game macros. In terms of physical design quality, both the Logitech G502 Lightspeed and the G903 Lightspeed are top-notch. It's also the better choice if you're left-handed.

Overall, the Logitech G502 Lightspeed is the better mouse in terms of design quality and maximum performance, but the Logitech G903 Lightspeed is by no means a slouch, and you can get your hands on it for a considerably lower price.

Razer deathadder vs logitech g502