Both have pros and cons.A revolver is more reliable but limited to 5 or 6 shots as a rule.To me a semi auto is easier to conceal and more comfortable since they are flatter in design.The semi auto mags have a higher capacity.The modern revolvers with the Transfer bars might be a little safer to carry.Ones with the shrouded or concealed hammers are a pleasure to carry.My carry gun is a Glock model 27. No exposed hammer which it a plus for carrying concealed.I do prefer carrying a semi auto.Any gun you carry being a wheelgun or a semi auto needs to be fired allot to check for reliability. Especially a semi auto.Allot of people carry semi auto (Eg 1911's Browning HP's etc) cocked and locked.I've never liked that idea myself.I've done it but was never comfortable doing so.My Glock has three safeties built in to it. I carry mine with one in the pipe ready to rock-n-roll.When your life is on the line and seconds count ,you don't have time to be jacking in a round.For someone experienced with semi auto's it's good choice. For the novice a revolver might be a better choice.
Ruger Redhawk