Compare and Contrast Interesting Topics?

Are these some good topics? Please give a thoughtful reason and if you can help me narrow it down to a topic that can be explained in 5-6 pages.

1940s Joker to modern incarnations of the Joker

Joel Gray's MC to Alan Cumming's MC in the film/musical "Cabaret"

Bruce Wayne/Batman to Hamlet?

Charlie Chaplain to Buster Keaton?