Personally, I don't care what you shoot. I don't want to stand down range of most any caliber.
I do carry a .40, though. Works for me.
A side benefit I didn't count on: I could still by plenty of practice ammo during the last "shortage", and 9mm was no where to be seen.
Oh, I have a few other calibers. Oddly enough, no 9mm.
I see no reason to carry anything larger than a .22 LR. Anything more is just compensating...