Good god, the irrelevant bias on this site.
Sasuke trained his own Mangekyou Sharingan through experience (as unlike Naruto he isn't the title character and Kishimoto can't spend entire arcs on his training), something that without, his Eternal Mangekyou Sharingan wouldn't have worked as effectively. Sasuke trained with his Cursed Seal, and perfected it beyond the level of any other. Something that without, Juugo's Sage powers would be completely irrelevant. Sasuke trains with high dedication, Sasuke has been training since he was a child, mastering Katon, while Naruto asspulls techniques which should require him years of experience by simply stating "Believe it" and using Kurama's oh so present effect on his chakra reserve since birth.
Sage Mode, took Jiraiya years to master and still couldn't do so to the level of Naruto who mastered the technique in weeks.
Kage Bunshin, a forbidden B-Rank technique designed by the 2nd Hokage, Naruto, who failed to become a Genin that day, with absolutely no skill in Bunshin techniques is able to use Taju Kage Bunshin, an A-Ranked variant, within a couple of hours.
Rasengan, the pinnacle of shape manipulation and chakra control, Naruto, with no talent in shape manipulation or chakra control, manages to master the technique within a week.
As was confirmed by Tobirama and Orochimaru this chapter, the Susano'o formed is purely Sasuke's potential, Naruto's cloak has nothing to do with his potential, therefore it is his own potential. Itachi hasn't factored in yet other than with his eyesight, and he won't until Sasuke has mastered Itachi's double Mangekyou, and once he does he will be twice as strong. This should be obvious as was demonstrated by Madara and it will be the same with Naruto when Papa hands him the other half of his present.
Seriously, I don't fault either Sasuke or Naruto for any of this but seriously the irate character bashing and bias got on my nerves.