Im afraid Im no big help on your question.... but I will tell you this: I know for a fact that CO is more strict than AA in terms of baggage allowance, weight limits and other rule/small print issues. This may not be of major importance to you, but its a good thing to know.

Also, I think that AA still has some 777 metal flying down here that has an F cabin, and as far as I know CO only has 2 classes of service.