True story bro, I know
nothing about terminal ballistics. I was never comfortable with 9mm because I heard over and over and over about Miami.
I started out with an RiA 1911 because that's what I was familiar with.
When I took my CHP class that's what I used.
Shortly thereafter my wife (who knows less about terminal ballistics than I do) suggested a .40S&W because she thought it would be cheaper than .45 ACP.
I purchased a CZ75B that turned out to be a
great (if somewhat heavy) gun. I think the weight of that CZ soaked up the .40S&W recoil till it was unnoticeable. When I qualified with an M&P40 for G4S the recoil was
very noticeable to me.
When I sold off all of my guns and started over I went with 9mm because my wife couldn't handle the recoil of the .40. Ten years later I'm arthritic and
I can't handle the recoil of the .40. I also can't handle an all steel gun on my hip for any length of time.
So I'm a 9mm guy by default.
Here is a very good article that addresses this issue
http://www.03designgroup.com/technotes/why-glock-why-9mm
QUOTE from the article
I thought back to the effects different pistol rounds having on animals, victim's of shootings, and Officer involved shootings that I had seen personally and read about during my career. I couldn't think of a single shooting where the person or animal was shot with a 9mm and lived, but would have died if the round would have been a .40S&W or a .45acp. And I could not think of a single shooting where a person or animal was shot with a .40S&W or a .45acp and died, but would have survived if the round would have been a 9mm.