Street stoppers and the Straussbourg tests are about the best ways to rate a caliber and bullet.
Street stoppers rates the bullets based on every shooting with that bullet design as a single hit to the upper torso.
What suprised me was the 45 ACP with ball ammo was a 64 or 65% one shot stop and 9mm Ball was one percent below it. The real suprise was the Winchester Silver tip in 32 ACP that was one percent below 9mm Ball.
The one story that really stuck with me about street stoppers was two guys in a boarding house get in a fight and were seperated. the one said I'm going to get my gun, the other guy said me too, they walked up the stairs side by side and came out of their rooms at the sme time. Guy A had a Jennings 22 pocket auto loaded with stingers, guy B had a Colt gold cup loaded with ball. Guy B laughs at Guy A and shoots him 7 times with the ball, Guy A returns fire with a single shot to the chest, Guy B falls dead with a stinger severing his aorta and guy A takes two busses to the hospital and lived. This story tells me 1 thing. Shot placement matters more then caliber.
I wonder if the two had the same budget for their guns and Guy A went with the cheap gun and a pile of ammo to get good with it and guy B went with the expensive pistol and a single box of ammo with the last 7 rounds staying in his gun.
Thus asking the question is it better to have the larger hole maker and fewer rounds for the budget or more ammo of the smaller 9mm . Does practice matter? Back when I was starting to shoot a box of 9mm was $7.50 and a box of 45 Was 10.00 the guns were similar. At the time My choices were a Sig or a Colt 1911 and I chose the Sig over a 1911 for a lot of reasons. And then went with a 9mm over 45 for two reasons. One the price of ammo allowing me on a college kid budget to shoot more and being able to carry dowble the ammo of the 1911 was a plus.
The sig was the choice for two reasons. A used sig was about $500 and a new colt was about the same price but the colt had to be tuned to shoot a single round (either ball, target, or hollowpoints) where the sig was designed to shoot a stagered mag of any of them.
I like the lego ability of the 1911 and being able to modify the frame to your tastes, the lack of those after market products for the Sig tells me that it is well made and people do not see the need to upgrade factory parts to make the gun work or work better. Telling me it is about as good as it is going to get right from the factory.
Later I added a 45 ACP in a Sig and with all the different guns I have owned I have never owned a 1911.
The new batch of 1911's that have appered since the late 90's such as the Kimber, the Sigs, the Can not think about it right now but they are reliable with a staggered mag of anything available in the caliber.
I used to get greif for shooting the Sig P226 and friends would ask when I was going ot buy a 1911, my old answer was when Sig made them and about 4 years later they started making them.
making me have ot change my answer to Why would I want one?
Maybe that will fire up this question.