Kabuto and Hashirama are non factors. So it's JJ Madara and Juubito vs. Six Path's Sage Mode Naruto and Rinnegan Sasuke.
-If Sasuke has the Bijuu, it's a stomp. They are already a tier above Juubito w/o their final buffs, with them, they are on a level where only Madara can fight against them, and Madara is tiers above Obito. Obito gets one shotted by Naruto or Sasuke's casual attack and then they gang up on, and seal, Madara away with the Sun Moon Marks.
-If he doesn't have the Bijuu......it's pretty much the same. Sasuke enters Susanoo, obliterates Juubito, and helps Naruto stomp Madara into the ground, as Naruto still has his final form.
Low diff win for Naruto and Sasuke.