It's very close, the thing is GALLY is only two shots then reload. Sniper is usually 6 and black hammer can be unlimited. The total damage you get from a session on atheon is more with a sniper due to more shots faster rate of fire and more ammo. Plus we won't move and your teammates can crit him as well
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Only way gjally does more damage is if you have 5 collectively firing on him, but it's sniper all the way fri be as I don't have one!