If we knew more about Minato's full arsenal I would likely pick him, but for now Sasuke still has Amaterasu as the highest card in this match, so I'd probably pick him. It's possible that Minato could pull something off to cut off eye-sight for Amaterasu w/ knowledge, but it seems unlikely at this point.
I was going to say Gamabunta would help but it would most likely be caught in a genjutsu by Sasuke unless he like drops it on Sasuke. Reaper Death Jutsu might take them both out, since Amaterasu still takes a bit to kill Minato.