Oh god what a question. While I love the p30 and think its one of the best pistols ever produced, I think the usp still has it licked in some ways. Mainly the fact that you can convert between every trigger variant HK has with the usp fairly easily, not so much for the p30. The rail is standard on the p30, not the usp. The mag release and ergos are better on the p30, but the usp isn't bad either. Usp mags are cheaper. It's really a toss up, and rest assured, if you buy one you WILL buy more. HKs really are Kochain...