If this question is for a choice between the two for "social purposes", there is no choice in my (experienced) opinion. No matter what "numbers" you look at, look at real world experience. The .45acp is more effective, period. I can reload my weapon so round count in the magazine is not a factor. Even if concealability is a factor, you can get a smaller .45acp. Cost of practice ammo, I can reload.
In my lifetime, I have had to "bet my life" on a .45acp a few times. It did not fail me. I cannot think of a single reason to experiment now.