If your concern is a charging 1,000 bear mauling you and needing to stop it within 5 rounds, there are loads far superior for that purpose to either 9mm or .45, so its a moot point. Likewise, the firearms that are suitable for self defense in a city situation are quite possibly not the best options for an outdoors scenario.
I am scheduled to go hog hunting for the first time this weekend. I'm bringing an P30 loaded with 9mm with me, and based on reports from people who I personally know that have hunted boar with 9mm, I feel perfectly comfortable with that selection. I keep wondering if I should also bring my 1911 as well, but it never crossed my mind to bring my 1911 with me instead.
I agree with a previous poster, this thread does feel like stirring a pot for no good reason.
J.Ja