I grew up with the George Reeves series, but when Christopher Reeve hit the big screen, that was the definitive Superman IMO. GR didn't play Clark Kent any differently than he did Superman, whereas CR had a more obvious contrast between the "mild mannered" Kent and the heroic Superman. Aside from the obvious glasses schtick, George Reeves' Clark Kent was no secret identity.

Brandon Routh was okay in Superman Returns (after seeing the initial publicity shots, I was actually bracing myself for the worst). He didn't embarass himself, but didn't make us forget about the previous portrayals of the Man of Steel either.

I think another intriguing poll might be who's the best Lois Lane. Personally, I don't think that anyone has yet done the definitive Lois. If you see how Lois is portrayed in the comics, I don't think anyone has yet matched that. So, an alternate poll might be who SHOULD HAVE played Lois Lane. RGA last week brought up Ashley Judd as a more ideal Lois Lane, and I think that's a great start.