Eh, Naruto has the most chakra in the Naruto-verse, but it's not like he can use all of it at once. He has an extreme amount of stamina just from the cloak/kyuubi/Natural energy. And all of those make him strong too. But it seems like the limiting factor is his body.

For an analogy, think of a fire hose. There's only so much water you can put through one once it reaches its capacity. If you want to move more water, you need a bigger hose/pipe.

My guess is that Naruto will beat Ei by turning this into a battle of endurance. Ei is going to run out of chakra, and Naruto will still have a lot left.

But where does Madara fit into this speed competition? He was keeping up with the Fourth pretty well.