I own both a USP and P2000, but when it comes down to it, I can't pick one or the other.
The USP is a great platform, good for range shooting. A little slow for competition use, unless you get it worked on a little. The reset is horrible on the gun, very long reset, and the grip is large. For myself, I had to shift the gun to release the magazine, and I have pretty long fingers. The mag release lever is great though. The DA pull is long and stiff, and the SA is decent. The safety/decocker acts as both, so you can carry condition 1 (C&L) or DA/SA. Negative is if you carry cocked and locked you risk disengaging the safety too far and decocking the pistol on your first shot.
You'll have to try one out yourself. Oh yeah, get rid of the stock sights, they suck too. Otherwise, it's a good platform.