CraigC
Sixgun Nut
30yrs of killing critters. I'm not at all saying the 9mm won't work, hell I carry a .380 more often than anything. But the undeniable fact is that bigger bullets make bigger holes and bigger holes incapacitate quicker than smaller ones. A small bore like the 9mm absolutely relies on textbook expansion to do its job. With a .44 or .45, expansion is a bonus but not critical. They 'may' all work on the average human in the average gunfight but they certainly do not all work "the same".Preferably ironclad, irrefutable, quantitative data sets proving this point.
I'll let the armchair self defense experts worry about "data".
All that said, equipment takes a distant backseat to skill and mindset.