I own both. They are pretty much the same gun with the LC9 having a better fit and finish. The LC9 is also better quality. My PF9 has had a cracked slide, and then the slide release lever broke. The PF9 has a lifetime warranty for the original owner. I would not want to own a PF9 without the lifetime warranty.
Both are very accurate. The stock trigger on the PF9 is better than the LC9 but the small radius curve hurts the finger. I installed the aluminum trigger which made a great improvement. The factory LC9 trigger is much longer and breaks when the trigger is pulled all the way back to the frame. This greatly affects my accuracy. After installing a Galloway trigger bar and hammer in the LC9 it is just awesome. The modified trigger reduced my group size to 2" and 3" at 7 yds.
My preference is for the Ruger LC9. For a hundred dollars more you get a better quality firearm in the LC9.
Glock 17, 19, 26, 21SF, 30SF
Beretta PX4 Storm 9mm, PX4 .45ACP, Beretta 92FS Inox
Beretta Nano, Ruger LC9, KelTec PF9, Kimber Solo
Smith Wesson 686P with 4" barrel, CS9, CS45, 3913NL
CZ-75B, CZ-2075, Ruger Mini 30, FNAR .308, CZ 452
Benelli M4, Remington 870, Remington 1100