[tahunua001]

it really boils down to personal preference.
I own both 45s and 9mms in both rifles and pistols. I like my 9mm handgun for concealed carry but I am way more accurate with my 45. I just got a holster so I could start concealed carrying it instead but I would feel perfectly safe with either.

for hunting this year I used a 9mm rifle on a deer, worked beautifully, a 45ACP would have worked just as well but I was out for challenge so I went with the smaller bullet. things to consider, would you rather be hit in the gut by the boxing lightweight champion or the heavy weight champion?

this issue has never been hashed out and never will be, there will always be personal preference. a lot of people compromise and go with 40 S&W, it hits harder than 9mm and has higher ammo capacity and hits faster than most 45ACPs. I personally own 9mms and 45s already so a 40 would be completely pointless, anything it can do, one of my other calibers can do better but if you really are on the fence and it doesn't matter which, perhaps the 40 would be best.

personally, if I had your job, I would feel a lot safer with 19+1 rounds on my side with a XDM 9mm than I would 10 rounds with a M&P 45ACP, and the same if I was carrying 15 rounds of 45ACP with an FNX instead of 10 with a M&P. if you already own DA/SA and feel that you are comfortable enough to trust your life and the lives of the citizens you've sworn to protect then by all means, the FNX is probably your best bet but in all honesty you can't go wrong with either.