We should all agree taht Itachi is greater then Sasuke. Itach couldn't even use his MS aslong as sasuke,Sasugay had for what a week or two, Itachi had it for atleast six years. Sasuke is always given powerups ex: curse mark, MS, and now all of Itachi's techniques and he is using them better then itachi. Naruto gets the fox which he hardly uses and when he does use it to make a difference he has no control over it even to the extent of harming those he has sworn to protect. Sure it has helped out alot even saving him from death, yet sasuke LVL. 2 curse mark could stand up to naruto's one tailed form. When he was about to die of chakra exhaustion during his fight with itachi orochimaru took over and basically saved him from death. Now he has complete control of his MS and he only used it twice, it took naruto almost a month to master his Rasenshuriken and thats with his mass shadow clones and without his sage training to be able to throw so even after a month it was still incomplete. I cant name one major battle were sasuke won himself-orochimaru was sickly, deidara blew himself up, itachi wanted to die,and he just ran away from Raikage and co. So sauke can do nothing on his own, and when his teammates do help he leaves them to die while he purses what he wants, versus naruto who would die for his teammates