I was trained on DA/SA pistols when my Sheriff's Office changed from .357 revolvers, to the new 645. As such that is mostly what I own in pistols. I have shot a DAO pistol, I don't like it. I regret selling some of my stainless revolvers, to buy semi-autos, wish I had them back. You will have to decide what type of gun to carry. I carry a CS 45.