I love them ALL! I have my favorite, and least favorite, things about each of them that make me love them all and I replay them all fairly often.
Right now, though, I have still not beaten and gotten through every single side quest and found all the cubes, etc. in Skyward Sword. I have no idea what the actual Big Boss is going to be like except really tough if some of the other bosses are any indication. I think I am going to have to give in actually use the game guide on this one though. Generally I wait till I have gotten through the game with out it than go back and see what I've missed...there is just SO MUCH to do and find with this LoZ game that I am certain I am going to want every advantage I can get when I face the big baddie in the final battle.