i think some of the old singer are popular and debut Actors are not much p[popular than singers, but young actors and old actors r more popular than singers..
This is a really weird thread and tough to answer, but I feel like singers are kind of pigeon holed to the type of music they perform where as actors, if they're good enough, can act in all sorts of genres of movies, giving them more exposure to different groups of audiences. So I think actors are more popular. They can rack up a bigger fan base!
In my biased point of view (because they are my favorite) Angelina Jolie and Brad Pitt is the most popular actor and actress while the popular singer is, yes no doubt it's MJ!
I think both but depends on where you look at it. Like if an actor has less international movies, he is not that popular, same goes with local singers. If both perform internationally, then they are popular. I think the question can be who earns more - singers or actors.
I think the singer is more famous than the actor. A song can be sung by different singers, but when a song was re-released, definitely reminiscent of the singer who first sang it.