I agree with the others, I own a USP, a HK45, a P30, and a P2000, they basically are all variations on the same design. The right one for you is the one that feels best to you and has the features you like most.
Personally, I am really liking the P2000 out of the group.
Agree build quality is the same. Also agree the usp has a better trigger, especially with match.
I'll add that I prefer the p30 and p2000 grips in 9mm, but prefer the grip of the USP and USPC in 45. the smaller caliber USP lines seem to have compact sized grips while the p series are a lot more generous for larger hands.
Same quality.....some of the best made pistols on planet earth!
HK45 Tactical || USP45 Tactical
USP9 Expert || USP9 FS
P30 V1 LEM || P30S V3 Grey
USP45CT LEM || CZ SP 01 Shadow
Tavor || Bren 805 S1 FDE
PTR91 || AK's AK's AK's
I have tried to love the USPc, but in the end it just doesn't feel right to me--the P2000, in spite of having a heavier trigger, is much faster for me to shoot, easier to shoot accurately, has less muzzle flip, and is more comfortable to carry. I'm sure there is someone on here that is exactly opposite, though. Pick what works for your mission and gives you the best results on the clock.