Ah man tough I still have to go with Legend of Zelda mainly because oot and majoras mask but dont get me wrong i love ff but Zelda just has better stories.
LOZ all the way. After Twilight Princess, WOO!!! Then there's Link to the Past. (btw, in Twilight Princess, the guy who teaches you the hidden skills may be the Link in LTTP. O_o)
Final Fantasy no contest! FF has such a better storyline and structure to it, i admit the LOZ is well thought out and entertaining, but only for a few days at best, FF can have you going for weeks or months, some people get hooked on one game for at least a year, the weapons, customization and the whole battle form is so much better than zelda in which you take two chops and they're dead, even the bosses are simple, in FF the you have to train for bosses sometimes a lot. Now a more comparable contest would be Legend of Zelda vs. Golden Sun which is like FF but smaller in format and it is more like a "ick on somebody your own size" kind of thing