9MM M&P Shield in the summer
with 2 extra mags and every other round is a hollow point.
My wife carries a Taurus Spectrum, with the extended mag, chambered in .380 ACP again every other round a hollow point.
In the winter, when it gets cold enough in Georgia to require a jacket, I normally carry my old government issued Colt 1911, of course chambered in .45 ACP.
Both the Shield and the Colt are single stack so I always carry at least 2 extra mags with me. I may NEVER need them, but IF I do I have them!