Sasuke Vs. Naruto
Well Kishi has said the last fight of the manga will be against Naruto and Sasuke
most likely this will happen when Sasuke goes after the two elders who along with Danzo got Itachi to massacre the Uchiha clan
Now, both charachters are due to get more power ups. What these maybe, we dont know.
But if we know kishi by now, the outcome of the fight will not be determined by what skill either charachter has, but by the intangibles. IT will be determined by the personalities, events of the past, and flukes that kishi decides to put in.
Here is my take:
neither one will "win" over the other, but naruto will be able to convince sasuke that the path of evil is not the right way to go... so regardless of how much they train etc etc blah blah
what will determine the outcome is not skills, but every little thing that has developed naruto and sasuke to be who they are today.
we saw this with pein... where naruto was able to convince him todo the right thing
madara said this isnt possible with sasuke, butttttttt
i think naruto will prove madara wrong