I recently had the fortune (or maybe the misfortune) to acquire Civ 4 and AC/AC in the same week; one was a gift--the other a purchase. Knowing how all consuming they can be, I just don't have room in my schedule for two all-consuming games. So, my brain gets to thinking...Civ 4, being the newer of the two, has got to be a more refined gamed, encompassing the experiences and knowledge of what was missing from AC/AC. In other words, I'm thinking that if one has to go, it should be AC/AC. Am I correct in thinking that C4 is a more refined game and is, in fact, a superset of AC/AC? Or are they totally different paradigms, each with their own assets and shortcomings? If I only have time for one, should it be Civ 4?