I would have to say deku nuts, i never used the Telescope in WW, And the spinner is pretty useless other than the dungeon it it found in, no matter how freaking cool it is.
But im about to rant, and this is something i really just noticed last night. Lantern Oil. Twilight Princess started Utilizing Oil that you needed to fill you Lantern in order to use it. Meaning if you are stuck deep in a dungeon, and had just happened to forget to fill you up a bottle of lantern oil, and you have a simple torch puzzle in front of you, you grab your lantern, give her a swipe..... No Fire, No oil, not many ways to get oil, what do you have to do.... Leave the damn dungeon. As if someone though "hey what if we actually had to put oil in the Most Common LoZ Item, that way you have to have the oil to use this common item, That sounds fun!" that person needs a swift kick in the butt for even presenting the idea of Lantern Oil!