All reason/all season....for an OWB carry guy like me, it'd boil down to a .45 ACP 1911 like the Sig RCS below, or one of my Browning Hi Powers....the one below is a pretty faithful copy...it's a Springfield SA-35. Currently, it's the most accurate of the three BHP types in my safe. The other two are both Brownings, one in 9mm and the other in .40 S&W.
For all day carry, a good 1911 or BHP will do nicely...and with an abundance of good loads, they'll suit most any purpose. Their weights are just about right to soak up recoil to allow good timely 2nd shots, and the two below are also blessed with excellent Novak type sights. Long familiarity with their grips and triggers has left me with on indelible muscle memory. No other auto's fit me as well, and none can beat their accuracy in my hands, From thistle tops to self defense encounters, they'll do quite well.
I carry, on the belt, back at the 3:30 or 4;00 position, and find they present in a timely fashion, Too, they're easy to conceal in that position under a shirt tail or jacket. I wear one or the other a cpl times a week here on the farm....and sometimes to town if the mood strikes me. I do have a Sig .22 Upper assembly that works well with the 1911 and dearly wish I could find something similar for the SA-35. Ciener might be an option but they're just not easy to find....
YMMv, but here are my choices. Best regards, Rod