I'll tell you this about the 9mm. The 147 sub sonic "FBI Load" was absolutely garbage. I have seen them fail to penetrate, for several shots!, at 15-20 feet range. Something about the bullet shape just made them glancers. The +P+124 Gold Dot (I think) we went to after that was much better but still abysmal compared to the reliable old 357 158 JSP. The 124 stuff failed in a shoot out and one of our guys died because of it. Then we went to a 45, the 45 GAP to be exact. Why? It was a little shorter so the midgets we hired didn't have to stretch so much to reach the trigger...and Glock gave a significant discount I'm told. Being able to say a State Police agency uses the 45Gap was good advertising. Time passed, the GAP died,and all those guns were replaced by Glock 45ACPs.
Anyhoo, my point is that when going in harms way you can never have too much gun, except when Division tells you that you'd best be happy with whatchagot, which is what happens to cops all over the country. 22, 380, 38, 9, 40, 10mm, 44 or 45. I'd be a lot happier having at least 1 of them, if not 2 or 3!, if I were back working the road!!!!