I carry an old S&W .357, the forerunner of the Model 27.
I like the energy of the .357 cartridge (no "stopping power" debates, please
), and the gun shoots like a dream. It's fairly big, being an N-frame, but I find I can conceal it pretty well. The mass also helps keep muzzle flip under control.
As far as advantages over autos, revolvers are *generally* more reliable. You won't get stovepipes or out-of-battery conditions, and you don't have a magazine spring to kink or weaken.
However, autos usually have higher capacities than revolvers, and are more concealable (since they don't have that big bulge in the middle). If I expect to get into a bad situation, I'll carry one of my autos, but my .357 and a speedloader is more than adequate for my everyday needs.
HTH.
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Ignorance is takin' over,
We gotta take the power back.
--Rage Against The Machine