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Avoid wireless at all costs, especially with high level gaming if you do that. I have had a couple wireless "Gaming" mice stop working randomly in the middle of matches before and screw me and my team over. Wireless can be interfered with by something as basic as a cellphone too. Not recommended. I would go for the G403 personally but if you're a more casual gamer you might prefer the more buttons of the G502. I have used both and both are very comfortable for a palm grip, but if you aren't heart set on Logitech, I would spring for a Deathadder Elite or a Steelseries Rival 100. This is coming from a Rank A on ESEA and LEM MM.
The G903 supports their new charge pad mouse mat which is pretty nifty. Charges your mouse while you use it.