A guy has .045 more inches and he's going to make a fuss...must have been pretty small to begin with to worry about that kind of difference.
I asked the local cops what they used and they said, ".40 you should see the size of the hole it makes". They had me at hole. Anywho, 9mm is a girl's round. I can get crazy muzzle velocity out of a .40 that you're just not gonna get out of a 9mm without blowing up a barrel. And when I have to shoot somebody, I want them to die. Quickly.