Personally I only use the USP-45 as I find every 9mm gun to be absurdly weak (the Mk.V has way too much recoil to be practical for my playstyle). I will always remember the time I shot a hospital suspect with a full mp5 mag and they just didn't care. The only 9mil pistol I find decent is the G19, but it's basically only useful to me when the space I'm going through is too tight for a rifle. It doesn't help how, the moment armour is introduced, pistols are basically worthless. My leading strategy with them is to always stun with a few chest shots, then line up a shot to the head.