Naruto... Sasuke gained the rinnegan from hagaromo and naruto obtained six path sage mode(which entails TSB), if you take away naruto and anything to do w the bijuu, Naruto's power up would purely consist of the sage mode. Ergo, in his base mode he'd have the natural energy and the balls behind him. But because he has the Kurama chakra that's why he has that cloak, as well as all the tailed beasts. So basically Naruto's power up = TSB, advanced sage mode, all 9 tailed beast skills. Sasuke's power up = Rinnegan with unique space time tech.
Naruto's power up was greater and because of his massive reserves and arsenal he would last longer. His speed and numbers are unmatched as well. Because Kaguya is immortal though he would lose. There is no way he can kill Kaguya so ultimately this discussion is stupid

. Naruto kaguya fight is the strongest naruto. Easily, GG