9mm, no doubt. Ammo's cheap (you should be able to find new commercial production for $100/K), there are tons of choices, higher capacity, less recoil, et cetera ad infinitum.
I never cared for the .40. If 9mm isn't enough gun for you, go with the .45. Either 9mm or .45, one or the other, IMHO. No others come close.
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