I happily voted for 9mm vs .40 vs .45. Ten or so years ago, maybe chocolate vs steel. But now my favorite caliber (9mm) often includes hollow points that penetrate 11 inches of ballistic jelly and expand at some point during that transite to 6/10". I have no experience with .40S&W, but plenty with the 1911 way back. I have never liked the 1911, so the .45 caliber has never figured high on my list. I'm a happy camper. A prejudiced camper, but a happy one. The more bangs, the better.
Cordially, Jack