I'll agree that the fit and finish on the FPC seems better. Only time will tell if it wears well, or if the design is durable or reliable.
I handled the S&W FPC, and I couldn't wait to give it back to the sales guy. They seem like a good option, lots of guys are happy with them so far, but they're really not for everyone.
I own both the KelTec S2K and the TNW ASR, and I strongly prefer both to the FPC. For someone choosing between all the PCC options, it depends on what they want, and what they're willing to put up with. There are a few reasons I won't own a S&W FPC, here's what I can think of off the top of my head: Weird proprietary buttstock, poor safety location, poorly executed bolt release, poorly executed magazine sleeve/spacers, poor options for iron sights, thick at the hinge and the buttstock, awkward and bulky when folded, and the long length of pull (which is not adjustable). It's also quite a bit heavier and larger in every dimension compared to the S2K. Oh, and M&P9 magazines for the FPC can be hard to find and cost about $80 each.
That said, I'm glad the FPC exists and it seems like a good option for a lot of people. If the list of negatives above doesn't bother you, it's certainly a "nicer feeling" folding PCC that doesn't require an aftermarket solution if you want to fold your rifle while keeping an optic mounted.