I vote for Mihawk because of his reputation and I believe he has the most powerful armament haki in one piece

I really don't know

This could go either way ig

Neither of them went all out before

Mihawk, mid diff.

The Mihawk overestimation is real on this poll. Mihawk as the world's strongest title, but that doesn't mean he's stronger than Sengoku. And you can't say he has the best armament in the anime when you have Garp who can casually create a mini nuke with his advanced armament haki alone.

Sengoku wins extreme diff though or it goes either way. Sengoku has statements and a solid reputation as well as being one of the few characters being capable of going toe to toe with prime Roger and was friendly rivals with Garp in their prime while also being known for chasing down Shiki.

And unlike MIhawk, Sengoku is actually a confirmed user of every type of haki. Not saying MIhawk doesn't have it, but Sengoku casually have confirmed conquerors while MIhawk doesn't gives Sengoku slightly better feats.