I think Naruto's major obstacle as far as the ems goes is genjutsu, he's NEVER been good at dispelling it and has shown to be susceptible to it on multiple occasions. Also unlike the 8 tails, I doubt naruto will have a symbiotic relationship with the kyubi and he'll 'watch his back' when he get hit with genjutsu as 8 tails did when he took sasuke to school.Once he overcomes that particular obstacle the amateratsu and susanoo are probably combat-able with use of sage AND kyubi chakra. Think of it this way, Naruto is like a TANK, DPS and Healer all in one, sasuke is a DPS and up till he lost the Orophile genes was also a healer. So in effect Once naruto can draw the fight out, sasuke will eventually have to retreat or will be defeated. In a battle of attrition Naruto will win.
My post never came through. What i was saying there is a different between who WOULD win and who WILL win . No i will not start this post with .. the name of the show is naruto lol . Instead I have to remind that what ever ending kishimoto writes he will have to create a fight that suits. He wont be able to please fanboys on both sides. I think kishi going to unleash some surprising bs lol. And its going to be well crafted bs but bs nontheless . Now if however they were to fight now or even in the future. Let me start this with I am a bigger naruto fan . First of all rate of growth between the 2 characters well sasuke shot forward a few times but naruto's potential and constant growth is much bigger than sasuke especially when u think about the fox. Naruto currently have more tricks but in a fight tbh sasuke's speed, precise assasin like moves . Well i will put it like this ... in a short fight naruto loss one time. Long fight - name of show is naruto(naruto had more time for more tricks)