
I guess Danzo if he has Koto.
Hiruzen was portrayed superior to danzo every time so there you have your answer.
In their younger years, but in old age Hiruzen plummeted whilst Danzo was doing pretty good considering his battle against MS Sasuke. Of course 10 Sharingans and Hashi's cells was responsible, and should give him an edge. The way he spammed Izanagi, Fuuton and let out a Mokuton was stamina old Hiruzen could only dream of being capable of.
Hence why I made him Edo.
hiruzen being an edo literally takes away danzos only advantage. The 3rd literally lives up to his rep in this matchup