The 9mm Luger round is questionable in stopping and killing power. But most of the negative stuff I read comes from the sandbox in close quarters when you want to dispatch the bad guy quickly. It takes multiple rounds.
The 9mm will never match the stopping power of the 45acp. I feel when in doubt if I second guess myself I ccw the 357,41,44 magnum. When your life depends on stopping power offer the bad guy the very best.

Don't underestimate the 1911/45acp loaded with those Speer 200gr jhp soup bowel hollow points. I did a lot of wet sand testing before I pick a round to carry.