BSM Naruto wins this mid diff,,
-His BM avatar tanked the juubi laser beam something thats far stronger than anything this sasuke can dish out,,,and with the extra SM additive,,, narutos durability is enhanced even further,,
-Narutos offense is far more than sasuke,,,he can create KB,, and get each of them to fire off FRS/COFRS and mini TBB,,, whilst he fires either a barrage of TBB or a super TBB,,(enhanced by SM),,,,, with this much DC,,, all of EMS Sasukes susnaoo varriants are destroyed,,, and therefore allowing naruto to finish him off,,,
-Surrounding the battlefield with enton or using amaterasu head on to naruto is futile here as well,, since not only can naruto evade them with his near FTG speed but he can also replace the chakra shroud if he ever does get hit,,,,
-If we also take the toads into account then Naruto can also defeat sasuke through Frog Song,,, which he can prep by creating BSM/BM KB,,, and using them to attack Sasuke whilst ma&pa accumulate enough chakra,,, to proceed the jutsu,,,,
-Even if we go in CQC then naruto has the advantage due to him having SM frog katas,,, and SM reflexes,,furthermore with KB,, he is getting outnumbered completely,,,,,
-BM naruto is a better matchup,,,as sasukes chances of beating BSM are quite minimal,,