I've only been shooting for about a year, mainly semi-autos. But I have read quite a bit here and elsewhere. Seems to me that the number of different ways a semi-auto can have a stoppage is a little larger than the number of ways to stop a revolver. But the question is not how many different ways are there?. The questions are how often is a stoppage going to occur and how quickly can it be rectified?
How often will a stoppage occur? Depends on the state of the handgun, the quality of the ammunition and the skill of the shooter. A dirty handgun has as much chance of failing for either type. Crappy ammunition can stop either.
The revolver may have a slight edge in the skill category since a limp wrist is unlikely to cause a stoppage on a revolver. Further, a shooter, with little enough experience that they would limp wrist it, is also unlikely to have the experience to clear the stoppage.
On the other hand, a person could give even a little attention to keeping the gun clean and functional, feeding it reasonable quality ammunition, and practicing with it a little. The person and the gun in that situation are unlikely to experience a stoppage for either type.
If I get to choose only a 1911 or a revolver, I'll probably go with the 1911 for the sake of increased capacity and ease of reloading. But I'd prefer a higher capacity semi-auto for those same reasons. That is in the context of self defense against bad guys. If I have to worry about lions and tigers and ... well, don't want to get Orangello going ... I might choose a nice fat 357 or 44 Magnum revolver for defense against big game.