I can't give the win to Minato, but I can give him a draw. With no restrictions on Edo Tensei, it wouldn't be too terribly hard for Orochimaru to win. Edo Tensei + Oro's genjutsu would likely do Minato in. We also have to think about the fact that Orochimaru is very hard to kill. Hashirama/Tobirama + Orochimaru/Manda/Yamato no Orochi are more than enough to deal with all of Minato's toad summons, as well as all of his abilities. You must also consider Orochimaru's true form, and the fact that Minato doesn't know about the paralyzation effects.
P.S. The summoned shinobi will not fight of their own free will. The kunais with the notes attatched are what bind the souls to the bodies. No kunais, no souls. End of story. You're failing to realize that Orochimaru has to simply throw out the summons and put everything on the table, not to mention Orochimaru's battle experience advantage over Minato.