Simply put: easier to clean, holds up better under extreme cold, generally more accurate, more suited in larger calibers that might be necessary (Bear/Moose), the revolver for both self-defense and survival reasons is most often the better choice than the newer semi's. The much more mechanically complicated Glock, Beretta, Springfield, Sig etc., are also often more complicated to operate usually with many people having a hard time with the slide release etc. A stainless S&W with rubber grips for survival, or a hammerless compact lightweight 38 revolver for self defense is hard to beat. -IMHO
Actually, revolvers are deceiving in that they are internally much more complicated (more moving parts) than a semiauto. Outwardly, they are indeed simpler to use. If you like them, than that is the weapon for you. I like them as well, especially in .357 although it is not my own first choice when I go shooting. I’ve recommended them many times to people who only want to own one handgun that is simple to operate.