I would say that when it comes down to it, both games are identical (except with the controls and the mirrored world, and a few other minor differences). And the decision is basically, which do you prefer? Do you like using the controller or do you like to use the Wii remote? Since Twilight Princess was developed mostly for the Gamecube, it will have graphics that suit it, but since it was ported to the Wii, you will probably notice that it doesn't have the graphics of other games on the platform. I personally like using the Gamecube controller as opposed to using the Wii remotes. But the decision is up to you.