Divinity 2: Ego Draconis is the original release, from a year ago. Flames of Vengeance is an add-on (only available separately on PC), which continues the plot seamlessly from the end of D2:ED. The Dragon Knight Saga is a remastered version of D2:ED together with FoV.
DKS contains a number of graphical and performance improvements over D2:ED, the flying fortresses were redesigned, most of the anti-dragon shields were removed, loot and enemy placement were changed (especially in the fjords), etc. Here is a
DKS review comparing it in general terms to the earlier D2:ED review.
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