Well, I guess all I need to say is that I own and carry my FNP, my USP45C is long gone. HK makes a really nice gun, but the triggers on the C models simply suck. Long, nasty reset and a mushy feel to them, not at all like the full-size variants.
The trigger on the FNP SAO that I have is just sick, nicest trigger on any gun I own aside from my 1911's.
Aside from the trigger (and maybe the fact that the FNP comes with two backstraps and a third magazine hehe), I'd say they're pretty much about even on everything else, except long-term longevity, we don't know that about the FNP's yet.