No feelings involved. No interruptions.
Naruto vs Sasuke = Sasuke
Sage Mode vs EMS Sasuke = Sage Mode
Kyuubi Mode vs Sasuke (EMS and partial Susano'o) = Kyuubi Mode (but it would be a good fight)
Bijuu Mode vs Sasuke (EMS and full Susano'o) = Bijuu Mode
It would be a tough fight but Naruto would win, in my opinion.
Take into consideration Naruto can only go into Bijuu mode for 5 mins and Sasuke has limited chakra.