Before ammo became hard to get (thanks Obama), I had gotten rid of almost all my handguns that weren't 9mm. At the time, it seemed like 9mm would always be the most available ammo. Of course that changed quickly. When there were ammo shortages, I seemed to always see .40cal available in stores. I've never been a big fan of .40, but I bought one for just that reason. I went with a XDM 5.25.
I've owned or fired just about every pistol that I care to. In my hands, the XD/XDM platform seems to be the most accurate.