Orichimaru (Naruto) vs Mayuri Kurotsuchi (Bleach)

Both at their peak.

Round 1: No extra help.

Round 2: Orochimaru can summon his Edo, and Mayuri has his Zombies and Nemu.

Fight takes place at Nanakusa Island (Naruto).

Orochimaru both rounds.

Orochimaru wins

Not seeing how Mayuri loses round 1. Maybe round 2.

R1 Mayuri

R2 Orochi with edo

Mayuri both rounds

Mayuri has a good chance R1, but loses R2 for sure

^

Orocchimaru can summon previous Hokages.