I think this ranks as one of the most controversial subjects in gun safety. Each has it advantages and disadvantages. The revolver advantage is that you don't get confused by the safety in an emergency, there is a lot less chance of it jamming, and you can just point and shoot. There is a lot less risk of it firing if dropped although automatics now have a safety for that. The one big drawback is the rounds that are available which is often a lot less than in an automatic in a lot of cases.

The automatic has a lot larger round capacity, it is easier to reload with magazines, it has a safety to help protect the shooter with hammer drop, and it can be a lot more compact and flatter than a revolver. The big drawbacks are a load jamming in the chamber possible making your weapon unusable, the possibility of it going off it is dropped unless your pistol has safeties for this which many of the new weapons have, and in an emergency situation less advanced shooters can forget, in a high pressure situation, to load the chamber or take off the safety. This can make these people more vulnerable to attack.