Doesn't matter.
1) I am a Bona fide old fart.
2) I recommend everyone use what ever you like, it's your life, family, property at risk, not mine.
3) 10 times I had to go to my secondary weapon, my sidearm, in military combat in Vietnam. 7 times it was an issue 1911A1 and three times it was a Victory model S&W.
4). Like many here have stated, accuracy was consistantly the second most important issue, after the first three, reliability, reliability, and reliability. (we are lucky that today we have so many high quality fighting sidearms to choose from.)
5). As you can see, MIND SET, SKILLSET, TOOLSET in THAT order is what you must take into the fight and of course apply your OODA loops. Thanks to Col. John Boyd.
6). Ability to maintain your weapons, cleaning a weapon is much more than just getting the carbon fouling off/out. ( hint, at one time I was a DI)
For the record, I most often CCW/EDC my custom Colt LtWgt Commander or usually one of my Colt Commanders these days. I prefer a Government Model, but age and disease have taken their toll.
I do carry 9mms either a HK P 30 or most often lately one of my Walther PPQ's (until you have shot one don't talk to me about any stock trigger except a 1911.)
When I will be driving outside the metro city area (Phoenix). Particularly when going closer to the Mexican Border. There is a higher potential for a larger number of miscreants. I will have long arms in the vehicle too, but ability to access them in most probable scenarios is not a high potential. Makes me feel better more than anything.
9, or 45. As always this ain't about the arrow, it's about the Injun. Remember, it is a poor workman who blames his tools, even in a firefight.
Go figure
Fred