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Sasuke is a weak guy, he said he wants to kill Naruto but he still feels like he needs all these powers in order to battle Naruto, that really shows how weak he is mentally. Naruto is still the medium of the tailed beasts and he also has Yin Kurama plus Yang SO6P power and Nature energy which is the Juubi's weakness.
Naruto is simply using only Kurama chakra at the moment and Kurama is also gathering Nature energy, which is like an endless source of Senjutsu Power, I see Naruto winning this, because if we think back at when e fought Kaguya, he was able to weaken her with his single attacks which is what will happen to Sasuke, also Naruto has the ability to pull the 9 bijuu chakras which he has shown against Obito and he can also destabilise the chakra by attacking it with a base jutsu mixed with the individual tailed beast chakras like he did against Kaguya. So I don't see any huge treat from Sasuke.
Sasuke has taken the upper hand in terms of power but the underdog will always win; I think Sasuke would have been better off battling Naruto with the powers that he's used to, such as his battle intelligence, Chidori, kirin, Fire jutsu, Amaterasu, Genjutsu, Susanoo (although genjutsu will not work on Naruto as we saw against Killer Bee, and Susanoo can be destroyed by Naruto, seeing what Kaguya did to it several times. Naruto can actually evade Kirin because he is super fast and can sense the danger of where it will hit earlier using Nature energy). However, it would have still been a better fight and Naruto suggested it by saying that this is not the version of Sasuke that he wants to fight (i.e. the one that acquired to much power and his battle strategy is power based) but instead he wants the version of Sasuke that thinks and uses the resources that he has in a crafty way.
Next chapter we would see OP Sasuke with 9 bijuu chakra Susanoo VS Endless Nature Chakra Naruto with Kurama chakra and connection to base 9 bijuu chakras
Can't wait!!!