The FN is feature loaded, you really get a lot for the price. Nice soft case, threaded barrel, three mags (with 15rd capacity), standardized bottom rail, raised suppressor night sights (with amber/green tritium no less), RMR cut from the factory. That's a lot of features! I'll admit mine took about a box of ammo to break in, but has been flawless ever since and I absolutely trust it.
That's not to trash the USP Tactical, as it is also an amazing pistol and suppressor host. The closest I've came personally is owning a pair of USPc's (still own a bi-tone 9mm). One day I'll pick up the Tactical as well, because more is better and the match triggers and adjustable sights both lend themselves for range shooting...and, well, because more guns are better! Overall I still feel if I could only have one I'd still have gone with my FNX Tactical.