Spider-Man, for sure.
Superman, being ultimately powerful and ultimately good, is boring from an artistic standpoint. It takes very little creativity to come up with a superhero like Superman.
Because there is one specific means of defeating Superman, all Superman plots revolve entirely around that one weakness, which makes all the stories about him boring, as well.
Furthermore, you don't really even get very good action scenes in Superman movies, because he just stands there and finishes all his problems with a single punch.
Spider-Man, Batman and Wolverine, on the other hand, have to actually use some skill, which makes for interesting fight-scene choreography.
-Bluejay (a.k.a. Mantis, Thylacosmilus)
Darwin loves you.