The Witcher Trilogy, bust mostly Witcher 3. Since it had a satisfying end to the series in Blood and Wine compared to my favorites like Mass Effect Trilogy.
In terms of replayability, Fallout 3, 4, New Vegas only because of the modding community it has and getting huge quest/story mods for those games that can basically be a another Fallout Title.
like Fallout: New California & The Frontier mods for New Vegas