I don't know anything about the FNP, but i can tell you why i decided on the USP 40.
Their barrels are second to none. Read up on the test where they jammed a bullet half was down the barrel, chambered a round and fired.
Their guns are extremely safe. The USP was designed as a 40sw then sized down to a 9mm. Other guns are designed as a 9mm then upped to a 40 using the same dimensions. How is that safe. The 45, at least the USP, was designed as a 45, it's dimensions are larger than the 40.
HKs do go KaBoom, due to faulty ammo, bad handloads, etc... but again read up. Many are able to be returned to service with a new frame and minor repair. Others are more of a worry on how you will try to repair your hand.
They have passed rigorous tests with great success, after all it wasn't a "HK frisbee" failure right guys....:biggrin:
Anywhoo HK is a no brainer, people only gripe on the price.
In a world of compromise, some do on price.