The thugs in Miami were also shot multiple times with shotguns, but I wouldn' t call a 12 gauge shotgun ineffective. I believe the one was finally stopped with a 38 special to the head. So that proves the 38 special is the greates manstopper going!
Seriously, I' m sure the 45 has an edge over the 9mm. To me the big pluses for the 9mm are the ability to be chambered in a smaller easier concealled package, and the vast amount of cheap surplus practice ammo.
I' ve carried both 45' s and 9mm and never worried about any practical difference in effectiveness. I' ll generally grab a 9mm due to it' s smaller size when I need a concealed weapon.