In my wild and woolly past, I have had numerous opportunities to observe gunshot wounds. If asked "Would you rather be shot with a 9mm, .38, .357M, .40, or .45acp?" my answer is "No."
Every one of these rounds can cause fatal wounds. It is far more critical to choose a weapon that you can shoot well, carry comfortably, and have complete confidence in. Over the years, I've carried a S&W .38 Airweight, a S&W M66 2.5" .357, a S&W M27 6" .357 (I'm a big guy!), and a Colt M1911 5" .45acp. I am now transitioning to a Glock 30, which I shoot very well - it fits my hands well, and I'm very confident in it.
My wife, OTOH, started with a LC9 and found it to be a poor fit. She is getting a S&W M&P 9c next week. She shoots the rental one better than any other that she tried, and enjoys it enough to practice a lot with it. The LC9 will become my pocket carry, as I shoot it just fine.
"Everything else being equal" NEVER IS. Experienced shooters have opinions based on their experience, and have arrived at what they feel is the best choice for them - but that may not be the best choice for someone else. If either the 9mm or .45acp cartridges worked for everyone, the 10mm would not have been developed in the way it was - and the .40 would not have furthered that quest when the 10mm failed to be the Universal Perfect Cartridge. There is no such cartridge, and never will be. The diversity of shooters makes a one-fits-all cartridge impossible.
Bigger is better (unless it's too big) and more is better (if they're big enough) and more, bigger and faster is better still (unless you fail to hit the target).
For me, being a XXL-sized guy, comfortably shooting a double-stack .45acp rapidly is not an issue. California further simplified the decision with 10-round magazines, negating the 9mm numerical advantage. This led me to look for a 10+1 .45acp compact - and the Glock 30 turned out to work well for me, but not so for my wife. She shoots a 1911 very accurately, and very, very slowly. For her to shoot rapidly and comfortably, a 9mm is the correct caliber. She will need a lot of practice to get faster, but because she enjoys shooting the 9c, she will get that practice.
Two in the torso and one in the head will ruin the BGs day with either caliber. Ten misses won't - with either caliber. The gun that you like to shoot is probably your best SD choice, as you're going to be shooting under different conditions than what you trained for.
Every one of these rounds can cause fatal wounds. It is far more critical to choose a weapon that you can shoot well, carry comfortably, and have complete confidence in. Over the years, I've carried a S&W .38 Airweight, a S&W M66 2.5" .357, a S&W M27 6" .357 (I'm a big guy!), and a Colt M1911 5" .45acp. I am now transitioning to a Glock 30, which I shoot very well - it fits my hands well, and I'm very confident in it.
My wife, OTOH, started with a LC9 and found it to be a poor fit. She is getting a S&W M&P 9c next week. She shoots the rental one better than any other that she tried, and enjoys it enough to practice a lot with it. The LC9 will become my pocket carry, as I shoot it just fine.
"Everything else being equal" NEVER IS. Experienced shooters have opinions based on their experience, and have arrived at what they feel is the best choice for them - but that may not be the best choice for someone else. If either the 9mm or .45acp cartridges worked for everyone, the 10mm would not have been developed in the way it was - and the .40 would not have furthered that quest when the 10mm failed to be the Universal Perfect Cartridge. There is no such cartridge, and never will be. The diversity of shooters makes a one-fits-all cartridge impossible.
Bigger is better (unless it's too big) and more is better (if they're big enough) and more, bigger and faster is better still (unless you fail to hit the target).
For me, being a XXL-sized guy, comfortably shooting a double-stack .45acp rapidly is not an issue. California further simplified the decision with 10-round magazines, negating the 9mm numerical advantage. This led me to look for a 10+1 .45acp compact - and the Glock 30 turned out to work well for me, but not so for my wife. She shoots a 1911 very accurately, and very, very slowly. For her to shoot rapidly and comfortably, a 9mm is the correct caliber. She will need a lot of practice to get faster, but because she enjoys shooting the 9c, she will get that practice.
Two in the torso and one in the head will ruin the BGs day with either caliber. Ten misses won't - with either caliber. The gun that you like to shoot is probably your best SD choice, as you're going to be shooting under different conditions than what you trained for.