Well Naruto has the senjutsu half of Hagoromo's chakra, a small amount of chakra from all 8 Tailed Beast (All of their abilities as well), the Yin half of Kurama and apparently some of the Yang half's chakra too, and Sage Mode.

Sasuke has the other half of Hagoromo's chakra, the super Rinnegan/Sharinnegan/Shinju's eye or whatever you wanna call it, and all of the abilities that it grants him.

So although they appear to be about equal, I say that Naruto is still stronger.