Kaido Vs Shanks

Name: Kaido
Epithet: of the Hundred Beasts
Occupation: Pirate, Yonko
Devil Fruit Power: Unknown, possibly the strongest Zoan
Haki: Unconfirmed (all three?)
Attributes: Immortal, Reckless, Merciless, Mentally unstable

VS


Name: Kaido
Epithet: Red Hair
Occupation: Pirate, Yonko
Devil Fruit Power: Unknown
Haki: Conqueror's, Armament, Observation (presumably)
Attributes: Very strong Haki, honorable, brave

Time: Post Timeskip
Scenario: 1v1 Fight to the death. Who wins and why?