I'm excited for both of them, but right now I'm leaning more towards Ocarina of Time 3D.
From what I've read about Skyward Sword, it's going to be very tough because it will require a lot of dynamic reactions and quick thinking just to beat basic enemies... and those are the things I cannot do very well. I'm all freaked out over the limited movement meter, and now I'm freaked out about having to block, dodge, and hit vulnerable areas. Everything I hear about SS makes me less enthusiastic, and more inclined to anticipate frustration.
OoT3D, on the other hand, is based on a game that I already know I like. It will have enhanced graphics, new controls, and allow me to experience the game all over again. It sounds like a good deal, because it's at least one new Zelda game I'm sure to enjoy.