I always carry, and for quick trips, it is a revolver. The S&W 340PD. It is light, about 11 ounces, and handles .357 mag. Since I'm mostly retired, I am often out for just a fast errand run and don't anticipate needing more capacity. This replaces both my Model 64 S&W, 3", and my 644 Airweight, which were the revolvers I'd most likely be carrying before I got the 340PD.
For more complex situations, shopping in big stores, going to movies, outdoor activities, road trips, I carry a pistol.