Oracle of Ages
Alright, I'm going to base my opinion on games that I have beaten.
If it was for games I've played, the answer would be Adventure of Link.
But since I have beaten that game, I'm going to go with the oracle games.
I liked Seasons a lot, but Ages wasn't for me.
After I finished Seasons, I was pumped to play Ages since I never played it before. But sadly, it felt to similar to Seasons.
First there's the oracle involved, and something to alter the gameplay(i.e. seasons and time), and the exact same characters. I know it was a continuation to Seasons, but they could have done something different.
Majora's Mask had the same characters from Ocarina of Time kind of. But the story was WAY different. I liked Seasons a lot, but my LEAST favorite Zelda game is Ages.