So I am finally getting in to one piece and let me just say it's a quite a series so this is one battle that was unfinished
no prep , in character , standard gear / wear , fight to the death or KO
Kizaru can't defeat marco easily it was proven in the series. It is also proven that he can't beat him at all by their fight.
I'd go with marco because he doesn't just logia reform he is the phoenix and heals. He looked to be pretty good when he smashed kizaru into the wall with that kick. And they were looking quite even as well. His durability also shows he can take a almost serious strike from garp and get back up easily.