Sasuke is going to dominate
...for a portion of the fight.
Theoretically, Sasuke with his 6 or 9 tomoe rinnegan, which nobody has had before in the manga and may be the strongest eye in the manga, he should have all rinnegan techs in my opinion. If Naruto, whose power mainly represented by the tailed beast inside of him, is turned to the max by having all individual beasts inside of him, and Sasuke whose power is represented through level of dojutsu, now has this OP rinnegan, they both should have every tailed beast skill and every rinnegan technique to be perfectly balanced.
In the first Naruto vs Sasuke fight, the fight took turns giving them both 2 times of domination. I think Sasuke is going to give Naruto a major run for his money, ultimately lose, but this fight is going to be beyond epic.
Could any of you see Sasuke using his tomoe rinnegan and pull a cheap shot and try to extract the beasts from naruto? Naruto doesn't have a seal on any of them it's totally possible. Really think of all of Sasukes current abilities and potential abilities they're virtually endless Sasuke is potentially the most OP antagonist that will actually not hold back.
Also I am staying firm to hashiramas jutsu is Sasukes trump card , a jutsu that can bind one who has sage mode and all tailed beasts inside of him .
And lastly, Naruto and even Sasuke has the potential to master wood style in this fight. Naruto because ashura is the origin of wood style in my opinion, and Kurama has some converse relationship w wood style, and Sasuke cause he has hashiramas DNA (which give Sasuke potential to awaken double rinnegan cause ashuras chakra is still in the DNA)