Kenpachi vs Grimmjo

I know that Grimmjo in his final form is powerful enough to battle Vizard Ichigo outright. However how does his power compare to that of Zarakai Kenpachi.

Give facts and explanations to back up your arguments.

Discuss!

I feel that kenpachi has shown greater potential for power advancement and character development.

If I am not mistaken Kenpachi has alreadly dispatched of an Esapda already.
Which would have given him a good insight into how the Espada behave.

Kenpachi I believe - He took down the 5th Espada; He supposedly possessed the greatest hierro amongst the Espada. So compared to Mr. Grimmjow Jeagerjaques, I believe Kenpachi is the greater adversary. 😊

Well Kenny beat a stronger Espada, and he did it easily once he got serious.