Muscle Memory
Although I would love to rotate around and give them all equal carry time.... I must admit that I am a believer in muscle memory and practice practice practice. If I were not using a G22 on duty, I would carry my 1911 more than likely. However, since that is what I shoot mostly and know the feel of best at this point.... that is my carry. I shoot a 17 in IPSC for that very same reason, same frame size, feel, function, etc as my 22. I KNOW that pistol and exactly where everything is on it. It's second nature at this point and that should be the feeling you have about anything you carry. When stress hits..... you revert to what you know best, even if it isn't in your holster!
Case in point... took my HK out last week and shot. Everything was fine.... then we went to shooting timed plates for fun. At time for a mag change I immediately hit where my Glock mag release was.... and I hesitated.... had to think about it. It was funny on the range, but NOT what you want if Sugar turns to $hit. Do I like shooting my Glock more than my others? No. I love my 1911's and HK. I shoot it most because that's what I carry.
Case in point 2: My mags have always been to my left hip. Going through Kilo classes, they required to place on right side right in front of duty weapon. Huge FUBAR for me. I tried and tried to explain, but that was a requirement until graduation.... to look consistent and uniform. Needless to say they are where I want them NOW.
It's all what you are use to.
I'm not good enough to carry several different ones and in a stress situation automatically determine which I have, etc etc. I carry a 642 for a BUG and have been shooting it a lot lately. Drawing from a different location (leg for me) seems to switch mode for me so the 642 is a no brainer at this point (after about 500 rounds).
Sorry for the long post.... as others have said... whatever you carry... practice practice practice.... and I hope nobody ever has to actually use it on someone. Contrary to what you see on TV, it's not a pleasant thing to have to go through.
GodSpeed!!