Sniper
When the game first launched I was blessed with an awesome fusion rifle drop, the purifier.
I used it for a while with some success till I accidentally broke it down trying to switch weapons. Since then and after getting many other weapons it has been almost all snipers for me. I don't even have the experience boost for shotguns lol.
Edit:
I just checked my stats and i would have to attribute my fusion kills being higher than my sniper kills to the vex.
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I think there's a way to look it up per weapon too