[Darkspeed]

I would say that it depends on the story itself. From the stand point of a superhero comic you generally can't have a hero without a villain, a protagonist without an antagonist. But to say which of the two is more important in an actual story would depend upon their actions during it.

Let's take Spider-Man and the Green Goblin for example, and let's go with the Death of Gwen Stacey storyline. Would GG be the more important character here because of everything he put Spidey through, or is Spidey more important because of what his actions lead to? In this instance, I'd say the Goblin, as his actions are the catalyst for what happens to Gwen and force Spidey to do what he did.