It might ruin some of the story, but its basically the same as playing it on the Cube, except graphics wise. I don't know much about it so maybe some parts of the story might not be included. Also I heard hooking up the two with a link gives the Gba extra levels, so its worth it either way you go. Just go one way and don't turn back, if I were you I would get the GBA first beacause of Zelda tieing you up.