It's a good question, Roethlisberger has been blessed with better weapons on offense through his career thus far but Eli does have the very talented Plaxico Burress, the reliable Amani Toomer, and of course Jeremey Shockey. Along with a fairly decent running game. Ben has Ward, Miller, Parker and he had Bettis, along with that great o-line. In terms of the two's actual play. Ben has impressed me more than Eli thus far, as i've seen Eli play some BAD football. But Eli played very well this post-season and maybe he's hit a turning point?
I think i'd say Ben is better right now, but it's close and they still have a long way to go.