I can't think of a single encounter I've had with a (suspected) criminal that wasn't directly related to working as a Security Guard and I think that had a lot to do with the fact that most of the time they had me working in stupid places at stupid times and watching over stupid people. Whenever I was working days, it was always those stupid First Amendment Auditors.
When I was working as an armed guard I carried an M&P 40 for G4S and a Glock 19 for Allied.
I never noticed that either gun made any real impression on anybody that I encountered at work.
Except, there was one counter girl at the Love's truck stop where I got gas every morning at my last assignment . I guess she decided that being a security guard made me a first responder so I got free coffee every morning and she always found a reason to come into the guy's bathroom when I was in there. She was a cutie but I'm pretty sure that I had been married since before she was born.
I had a couple of people who tried to snatch the M&P40.
I had a few people tell me that it wasn't real or it wasn't loaded or that they were going to beat my *** and take it away from me or question why I felt the need to carry a gun at work (Because that's what your employer contracted for. If you take issue with it, please feel free to take it up with them.)
The two things that I carried that made the most impression on people were my OC spray and my phone.
I've told this story before, I ran into a wino at Pinello Ranch in Colorado Springs who told me that he was going to get an ax out of his shopping cart and cut my head off with it and the fact that I was armed obviously made no impression on him whatsoever and he heard me on the radio talking to my boss who was telling me that the El Paso County Sheriff's Department was so many minutes out in route to me but as soon as he saw me take my OC spray off my belt and start shaking it, up he dropped the ax like it was on fire.
Whenever I had to ask somebody to leave property they would rant and rave and cuss me out and tell me they were going to beat my *** and all sorts of things like that and I would pull out the company phone put it on speaker hit the autodial button for CSPD (never 911) and as soon as they heard "You have reached the Colorado Springs Police Department Fire and Emergency Rescue switchboard" on speaker they left.
I will say that right about the time I quit in October of 2021 the phone didn't have as much as of an impact because everybody knew the Police weren't coming.
I carry the same Glock 19 I carried at work. I'm used to carrying it. I don't really feel like it takes up that much space on my belt and I can dress in a way that conceals it well.
Whenever I'm going someplace where I can't conceal a Glock 19 I carry my Glock 26 in a pocket holster in my right front pocket.
Kramer Leather Holster BTW
It seems to be a lot less for hassle to me to "rotate" between those two guns than to switch between a bunch of different guns.