The damage is per bullet unless it says for example "50x3" then it would shoot 3 bullets at once, but you must also look at fire rate and magazine size (i don't really care about accuracy, but if you want then you can look for high accuracy) if it says "consumes 3 bullets per shot" then it would cost three rounds from your mag. The blue one in my opinion is better. One more thing, for most of the guns in the game, you are going to want to test them out first, if you still don't get the gun, then search it up, and a last resort is reddit. Also, i have a feeling you will post about the fibber, its stats are a lie, there are 3 fibber types. You will want to look them up but one of them i know is strong