Definitely Calderon. Bruno is the more naturally talented player, or was at the beginning of last season, but is far less effective than Calde these days; he pulls out of tackles and 50/50s as indicated by others above, he tries too much fancy-dan stuff that too often puts us in trouble and his understanding with Buckley is nowhere near as good as Calde's.
Yes, last night was his best game this season, but he still wasn't as good as Calde has been, and was poor in the first half.
Old boy behind me last night really doesn't like Bruno, came up with my favourite quote of the season last night. "Why's he picking Bruno, he's only in the team because he's Spanish"