Spirit Tracks. It was nice to FINALLY have the namesake of the series at your side. and as a guide, She wasn't actually annoying like Navi,(Is that like, a bad word here?) or Fi,
Those games have totally changed my opinion on Zelda. I used to like her okay, but after playing those games, I argue to myself whether I like Midna or Zelda more.
As in appearance I would say TP Zelda, she is the most beautiful one.
As in personality I'd say SS, she has a great personality and (finally) has something romantic with our Link
Definitely Twilight Princess Zelda, so far. Very beautiful, and very sad. Like someone else mentioned, you really got the feeling that she needed your help desperately due to her decision.
SS for me, I just loved the intimacy and brooding romance between Link and Zelda.
The scene where she asks Link to come wake her up and he bows his head trying to keep the tears away is so heartfelt and touching
TP Zelda was cool too, it was clear that she needed Link's help to save Hyrule, and her selflessness and sacrifice to save Midna was what the princess of Hyrule should be like.