But the military prefer to use the .45 as it is a more powerful round
The main pro of the 9mm is you can have 12 round of 9mm in the same size of 7 rounds of .45.
Despite this I feel both rounds have there own place and so taking one or the other is a good choice.
No matter what bullet you have it can kill something.
Hell even .22 can kill people !

I was more joking about the .44 anyway :p
its complete overkill to be honest but I wanted my guy to have a large gun that he can try and scare people off with because that's the kind of guy he is XD