“Less recoil, more bullet capacity gives an edge to the trained shooter using 9mm.”
This comes into play if the bad guy is armored like the North Hollywood bank robbers and a headshot is required.
Another advantage of the 9mm that a lot of folks miss is that the .45 loses a LOT of critical velocity when used in very short barreled concealment handguns. The lighter/faster hollowpoints tend to expand more reliably in those applications.
I reload a formula with the .45 that nearly duplicates the Cor-Bon DPX, first off the bullet is a solid copper Barnes Tac-XP 185 grain that has a super deep cavity that when it fills with organic matter and not clothing fiber, drywall, or sheet metal it expands into four segments on average to about 1.25” and it moves much faster than the traditional 835 fps a 230gr ball will do.
I have tried the .400 CORBON which is a bottlenecked .45 case propelling a .40 bullet but I was not impressed. For extreme conditions such as in the bush and I know black bears are nearby I carry a Glock 10mm. The .45 with a faster 185gr bullet is still accurate and delivers a proven bullet design that though its copper it has a unique predictable destructive wound channel.
For my Alaska big game hunting cartridges I use the Barnes Triple Shocks all the time now. Instead of a controlled mushroom effect from a lead bullet Barnes has designed literally a high speed auger propeller blade effect with its bullets, a deep massive wound channel that placed properly drops big game very fast.
Their handgun bullets are being adopted by many law enforcement officials as being highly effective and being lead free, but this one works very effective at the same time.