The PF-9 is about the same size as the P-11. The only difference is the 11 is a double stack and the 9 a single stack. Therefore the P-11 is a little thicker. I carry the P-11 daily and find it to be no problem to conceal at all. If you have larger hands, I'd suggest the P-11 as the PF-9 may be a little narrow for you. Of course, go to a gun shop and handle both. I love my P-11 but you may find that you don't.

Oh, and I'm guessing that you meant PF instead of PS.