The problem with Naruto is we never seen him fight without Kurama, Naruto has always been powered up by Kurama. We had a chance to see Naruto fight without being a Jinchuuriki but Naruto fell uncousin unlike Kushina who lost Kurama but was able to fight. Basically we never seen Naruto use his own power and just his own.
Sasuke we seen him fight with his own powers and nothing else. When Sasuke got CM that was borrowed powers, but we saw Sasuke fight with his own powers before getting CM. When Sasuke lost his CM that was Sasuke using his own powers and it lasted till he got EMS.
Sasuke may have had team mates, but that doesn't change Sasuke was using his own powers with no enhancement.
Basically Naruto has no feat without Kurama, while Sasuke has feat without CM and without EMS.
Sasuke we seen him fight with his own powers and nothing else. When Sasuke got CM that was borrowed powers, but we saw Sasuke fight with his own powers before getting CM. When Sasuke lost his CM that was Sasuke using his own powers and it lasted till he got EMS.
Sasuke may have had team mates, but that doesn't change Sasuke was using his own powers with no enhancement.
Basically Naruto has no feat without Kurama, while Sasuke has feat without CM and without EMS.