Minato would win. Orochimaru's attacks are mostly close mid-range attacks and area where he is inferior to Minato due to his speed. Minato could tag him with a never disappearing marking, or share some of his chakra with him during a contact
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And we know Minato can teleport anything connected to his chakra [
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], so Orochimaru would basically become like his property in this case. With continous rasengan attacks, he would either wear him out or kill him(i personally think 1 or 2 rasengan would be enough, but it depends on how high you rate Orochimaru's resilience)