Which would you prefer, and why?
USP9: Capacity: 15 rounds MAX; Magazine: plastic-- similar to a Glock.
USP45: Capacity: 12 rounds MAX (rare); gun is slightly larger than the USP9; Magazine: metal
For some reason, I prefer the .45-- don't know why. Probably becuase of the magazine construction, and for some reason I think its better balanced (probably depends on the weight of the bullets).