Dance wise Chris was fractionally a better dancer than Ed is now. Chris was embarrassed lots of the time during his time on the show, so tried most of the time to dance in a way that was going to help lessen that feeling (like dancing more seriously when he could and not using a comedy crutch). He wasn't a great dancer by any stretch, but not the worst in that series either, and I don't think in persona or ability he and Ed are actually comparable.
Chris had the underdog tag as the comp went on and the popularity of his partnership with Ola became more apparent. They were the cute 'Hobbits', he called her 'Ola chops', they were underdogs against Natalie the 'new try hard pro' and Ricky the 'too good already arrogant up himself actor' and all the rest. Chris is a better dancer than Ed overall, and not all his dances with Ola were comedy themed, so he was a bit more varied in his approach. I think a lot of people still remember their Rumba, as felt quite touched by it despite him not dancing it amazingly (he did very little in the grand scheme of the dance) but I think it was more an emotional connection that won a lot of fans over to them if weren't fans already.