I've never shot the P3AT, but have owned a PF9 for a year now, and have not had one failure to anything in the approximately 600+ rounds that I have fired through it. Everything from personal defense rounds to Tul Ammo. Softball sized accuracy within 15 yards.
.380 wise, look at a Diamondback DB380. The trigger pull is heavenly compared to the P3AT or LCP. I have shot the LCP, and do like it, but just not near as much as my DB380.