Of course shot placement trumps all. But, the laws of physics are immutable.
Prior to the recent declaration of 9mm being deadly again, by the Famous But Incompetent, I can't recall anyone who went armed for a living carrying a 9mm - other than as a BUG/off duty or court gun. We all had issued 40s or personally owned 45s off the approved list.
Then again, we also had other requirements that had to be met that have been done away with so that new officers can still be hired. And it can be VERY difficult to get a 5 foot nothing individual with small hands to shoot a qualifying score of 70 with a full size duty pistol chambered in 40 or 45. Especially with no money budgeted for firearms training. But I digress.
I will point out that not too long ago, the LAPD METRO division, which includes RHD, SWAT AND SIS - all units charged with persuing armed felons - were all armed with 45 caliber handguns. And today, 45s are the only sidearms authorized for LAPD SWAT and SIS.
Also keep in mind, when the ammunition companies upgrade the design of one of their rounds - they upgrade ALL of their rounds.
Carry whatever you shoot best and can get a fast accurate hit with AND a fast accurate follow up shot. I am not disparaging the 9mm. I can occasionally be found with a 9mm on. Especially when it is hot and miserable and I am tired from working 70 hours in 4 days.
But on my partime job, where I am statistically most likely to engage in social gunfire, due to location and having a commodity desired by miscreants who are unable to obtain it legally, I will be carrying a 45 caliber handgun. Because it kills bugs dead. My 0.02 Regards 18DAI