MS Sasuke wins, because Old Hiruzen can't avoid Amatarasu and don't have any counter against Susano. + MS Sasuke is a teenager ( 16 years old), physically in his prime, while Hiruzen is 68 years old (would be 71 years old in Shippuden), it would be even worse than what Danzo did against Sasuke. At least Danzo had Hashirama's cells and Izanagi, while Hiruzen don't have any hax ability.
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However, Edo Hiruzen wins, because he is immortal, so Amaterasu or Susano wouldn't be a problem to him, his body can regenerate itself, and MS Sasuke doesn't have any sceal jutsu to stop Edo Hiruzen. And we have seen how it was long and difficult to MS Sasuke to kill Danzo because of his Izanagi spamming, now imagine an Edo Tensei zombie who regenerate itself endlessly with no sceal jutsu to stop it.
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