I've used both when it counts and I'll take the .45 anyday and twice on Sunday. Shooting for fun is fun but when it comes to your life or your fellow soldiers you want a .45.
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Had to do this lol but really I prefer a .45 over a 9mm.
Being an old drag racer I say "There is NO replacement for displacement.
Bigger is always better... that being said sometimes it is not practical to carry the big bore. The easier choice is a smaller caliber platform for carry concealment.
The real question is if you KNOW you will be in a gun fight which bore do you want?
I saw a quote the other day that said "carrying a weapon should not be comfortable...It should comforting!"