I carry both. My carry weapons are a Kahr PM9, S&W M60 and a Ruger LCP. I like the simplicity and reliability of the revolver, plus if you have to jam it in the BG's gut and fire you don't have a failure to fire due to the slide being out of battery. One good thing on the hammer spur is you can draw and cock (if the situation warrants it), so grabbing the cylinder is a non-issue. The Kahr and LCP are easier to conceal (the LCP is my pocket gun when I can't carry anything else), plus the Kahr is scarily accurate.
Personally I think, with a good holster, a smaller revolver will conceal as well as an auto, at least OWB. The cylinder adds a natural curve that makes it blend in with the body.