Board Thread:Naruto Discussions/@comment-28294008-20160424155402/@comment-142748-20160424231556

Only in Part I they were near equals. In Part II, Sasuek had the edge until Naruto got Sage Mode, and he widened that gap with every powerup since. By their Rikduo power up, Naruto solidly had the advantage over Sasuke in every category due to mastering Kurama's power and having Sage Mode and combining them, a fact Sasuke got angry about due to how far ahead Naruto was now.

Post Six Paths Sage Mode and Rinnegan, Naruto still was stronger. This is apparent during their final battle: Naruto had multiple handicaps. He was exhausted from fighting in the war FAR longer than Sasuke. He was holding back against Sasuke. Sasuke powered himself up mid-battle to boot! Naruto still defeated Sasuke despite these disadvantages and handicaps.

Sasuke himself still considers Naruto stronger than him well into adulthood, as shown by his training of Boruto. And the fact Kishimoto compares Sasuke to Piccolo: we all know that Piccolo was weaker than Goku was.