As Robzkt notes, many have had good success with Speer Gold Dot (either standard or the LE version which is the same), but a few have not. Other good choices include Corbon DPX and Hornady Critical Defense. But many PF-9s can be ammo picky, so the best bet is to choose 2-3 good loadings (based upon tests for expansion, etc in short barrels) and see which one(s) work best in your PF-9.
Jim R