lmao, that Zetsu hype is being completely exaggerated. First off, a case could be made that this version of Sasuke he's referring to is
actually < Juuin V2 Sasuke. This version only has Amaterasu, but neither Enton nor Susano'o, lacks flight, fast regeneration and the overall Chakra, stats & power boost from Juuin. Plus still hadn't fully healed from fighting Itachi. Furthermore, Zetsu is referring to Naruto's feat of defeating Pain, which included not only SM, but also Kyuubi transformation. I suppose Kyuubi is restricted here, since otherwise this would be a complete stomp.
That being said, I still see Naruto winning, but not below high-diff. Juuin V2 is essentially Sasuke's own SM. He's way more strategic and intelligent in fighting, and Naruto still lacks a proper answer to Genjutsu. Which Sasuke uses masterfully, e.g. the fight against Danzo, where it was used so subtly that even he as Sharingan user was fooled by it. Don't see what's stopping him from Sharingan-controlling Bunta in a fashion similar to Manda, either.
So yeah, this isn't nearly as one-sided as people might think.