I actually think the Paris version is by far the nicest of the three versions, but I suppose it depends on personal opinion. You have to surely agree, though, that Tokyo's tower would look totally out of place in WDS. Not only does it have the wrong theme (New York not Hollywood) and the wrong colours, but it's so so crowded with detail - in DisneySea it looks alright, but imagine something like that in WDS!! The DCA design will look great in Paris, don't worry.
I definitely love the sleek art deco design more:
http://upload.wikimedia.org/wikipedia/commons/1/1a/DisneylandTowerofTerror_wb.jpg