Before buying I looked at both the P-11 and the PF-9... I chose the PF-9 as a concealed carry handgun... It is slimmer and more easily fits a pocket holster without "bulging", which is my preferred form of carry (Were I planning to carry it in a belt holster, I may well have chosen the P-11.) ... Fully loaded the PF-9 is considerably lighter than the P-11, and of those that I looked at the PF-9 had a "better feel" to it, more natural to grip and point, and a "less stiff", trigger pull... After buying the PF-9 I cleaned it, then took it out and ran something over 250 rounds thru it...my handloads and commercial ammo, hard ball and hollow points... Not a single hick-up, baubble, or failure of any kind. It hit the ground running and never looked back...... The only "advantage" of the P-11 that I could see was that it does offer more rounds per magazine. But, I just bought a couple of extra magazines for my PF-9.
I'm sure you would be happy with either...but for me and my preferred means of carry, I'm completely satisfied with my PF-9.