It's funny how 2D mario is simpler than 3D mario, but 2D Zelda is much bigger than 3D Zelda.
I vote 2D. I well get a 3D Zelda on Wii U for sure, I want to play a 2D Zelda with modern sensibilities.
2D games are always bigger than 3D games, and they are IMO better for exploration. I want 2D.
I like 3D games just as much, but variety is always nice.