I used to think Naruto would win though now I think Madara would win by portrayal.
Though Madara isn't at Hagoromo's level, I don't think he'd be below half his power anyway...
Regardless, Naruto does have a way of defeating Madara and that's through extraction. Though he has more of the Bijuu chakra, the Tailed Beasts will be working against him so it should work if he's weakened enough. I'm also not so sure how he'll regenerate if there's no trace of him left. As in nothing left to regenerate from if he gets completely obliterated. Hidan was also immortal but what would happen if he gets hit by a Bijuudama? Madara by the same Rasenshuriken variations that Naruto used against Kaguya all at once?
I'll go with Madara High dif if Naruto uses Ashura avatar and Multi Shadow clones unlike the fight against him. The same fight in which Madara didn't use PS nor Mokuton clones.