I don't associate the two as they aren't the same team developing them.
Civ has been dead to me for awhile, it suffers from much the same problem as TW, the ideas that constitute the core game play have been exhausted, they have no new story to tell me.
Whereas XCOM is doing something new from the last game, we've flipped sides in effect. In the first game the aliens were invading earth, in this iteration the invasion succeeded, and humans are now the counter insurgency fighting to take earth back. And as you said, this time full mod support is in the package from day one.
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