He's a better actor.Eric has gotten more screen time due to the fact that he is popular. Entertainment Weekly had a poll with the top vampires and he got 42% to Bill's 10%.
I can't think of the name of the actor who played Godrick, but flat out that was an unbelievably awesome performance. What was interesting is that Godrick raised tons of ethical questions about the direction of vampires, whether or not they were evolving as a species. And what role did they have. Godrick seemed to be of incredible acceptance of humans, etc. and had a completely different view as to their role in the world.
I found that entire sequence to be incredibly well written, maybe the best of the series. Easily, this was the deepest episode as far as establishing the mythos of the show.