Christopher Reeve's my favorite, but mostly for his portrayal of Clark in Superman III.
In it, he was still the timid, introverted Clark from the previous two, but he wasn't exactly nerdy. He's not cool or strong, but a good person and someone a lot of people could relate to imo. And he's not exactly like Superman either, they still appear to be two different people.
So it's the perfect combination. Clark isn't annoying, and the disguise is still intact. To me, his Clark Kent persona in III is what Clark would really be like if he didn't have powers.