I have both the SW 3913/14 and a SW 642 revolver. Since my hands are medium large, size 8, I prefer the larger 3913/14 pistol. I can get all my fingers on the grip with no problem but can't on the 642. I carry an extra mag on my left side which is flatter than a speedloader with 5 rounds. I carry IWB for both. I have no experience with the Bersa or PPK. If you can get your hands around your choices I"m sure one will feel just right. Good luck.
best wishes- oldandslow