I think if somebody appeared cold and calculating out of this duo, it was Bane. Loki is supposed to be the God of Mischiev, but in this regard his plans and what he accomplished was in no way bigger or more elaborate than Bane schemes.
Also I don't see how the revelation of Talia's character (though stupid, unnecessary and hurting TDKR as a whole) makes Bane *****-whipped. He just worked with her that's all. He was an acomplished mercenary and a guy who drew CIA attention by performing coup's in the third world, long before the events of Rises. They shared beliefes, but the plan and execution was still as much his own.
Both I think probably were I just think Loki was done better in that regard.
As far as Bane himself I've written a couple posts after seeing the movie on why I feel this way. They're in TDKR thread so you can check it out there. Readers Digest version I just think they built Bane up only to cut off his manhood at the end with that lame twist. I will eventually buy TDKR but I still haven't which for me sucks because I do think it was really well done up to the last movie.