I agree with the post that identifies Rural Carry versus Urban Carry.
However, I would go one farther: Urban Open Carry vs Urban Concealed Carry.
I am in California, so mag limits are in effect.
Urban Open Carry:
Semi-Auto: M&P .45 full sized- as it gives 10+1 rounds of .45 where I want it, when I want it. I love 1911s, but they have 8 rounds instead.
Revolver: Ruger GP100 4" barrel- able to fire full-buffalo bore type hot loads if I need to shoot an engine block or through a door when on the mean streets.
Urban concealed carry:
Semi-Auto: Toss-up between M&P 9c [I don't shoot .40S&W well at all] and a commander-length barreled 1911. I have the M&P9c and a Kimber Compact II, for example. I shoot 9mm better, especially with my left/off hand [due to an accident and long-term weakness in my left wrist], than .45, so I could hit what I was aiming at. Love the balance/feel of both, and they conceal pretty good on me.
Revolver: probably the Ruger LCR, as it has a VERY nice DAO trigger out of the box and would fit in pocket or inside waste-band pretty well.
Rural open carry:
Semi-Auto: Hmmmm. I'd really probably go back to the M&P .45 FS, but that is because 10mm is too much for my left wrist while I can do .45 for a magazine worth, if needed. Again, I LIKE a LOT of other pistols, but 10 rounds of .45acp in +P is a pretty good package.
Revolver: .44Mag version, probably a Ruger SuperRedHawk with 7.5 barrel, but that would be difficult to pull out in an emergency. I just like the ability to handle hi pressure .44mag loads for longer than a S&W 629 or 29. Would prefer a barrel around 5.5" instead though, so might go RedHawk, or a 5" 629 instead.
I agree. There are TOO many great designs.
And the selections may change if I were in another state and could carry a Glock 17 with a 20 round magazine, for example.