Who would win in a fight between Sasuke and Naruto?

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Naruto and Sasuke are the main protagonist and antagonist throughtout the whole anime and manga series. Although they have faught before, I want to know who would when in a fight to the death. Naruto Nine Tailed Gox is pretty strong but, Sasuke have the the curse mark seal which I think is equal to the Nine Tail Fox. Who do you think will come out undefeated?