This argument has been around for awhile. As for me,.45 cal. in 1911 platform was my preferred EDC for decades. But like the author of the article below, I have deferred to 9mm in my old age. The bright side is I have found a good compromise in the Springfield Ronin EMP3 which is a 9mm in a 1911 platform with a 9+1 capacity mag.
.45 ACP vs. 9mm: Which Bullet Is Truly “Best?” (msn.com)
.45 ACP vs. 9mm: Which Bullet Is Truly “Best?” (msn.com)