My first handgun was a revolver -- a S&W 640. I liked the simplicity, the DAO trigger (which meant it was pretty unlikely anything could snag the trigger and set it off), and the reliability (revolvers have much less about them than can cause them to fail to go BANG when you pull the trigger). I also liked the size -- I can carry it in my pocket.
I don't like the capacity -- 5 shots, but realistically, most SD shootings involve 3 or fewer shots, IIRC.
My second weapon was a Glock 30. Double the capacity, and a larger bullet. Plus, I find it easier to hit with the Glock.