perk 2..............but then again they all important as perk 2 i think is to improve kills with stopping power etc . perk 1 is wot u carry ... extra grenades , bettys etc.
and perk 3 ,,, is your skills .....dead silence , iron lungs ...
between 2 and 1. two because you get stopping power which is a life saver for assualt. and camoflauge for snipers and recon. but 1 because you get betties for snipers and mines. satchel charges for tanks and traps. and extra grenades and such same with rpgs for tanks as well.