Naruto and Sasuke are equal in strength. Why does it matter if Sasuke beat Naruto when they were 5 in a 3 second fight?
But honestly Naruto won the last fight. Technically it was a draw but Naruto achieved what he wanted, he turned Sasuke back to good.
And just for the heck of it here is a powerlevel comparison of Sasuke and Naruto:
Start of series - Sasuke neg diffs Naruto
After learning kage bushin - Sasuke low diffs Naruto
After the bridge mission - Sasuke mid diffs Naruto
After chunin exam: Naruto high diffs Sasuke
After curse mark (valley of the end): Sasuke wins very high diff
Start of shippuden: Sasuke wins mid diff
After the fuuton rasengan: Sasuke wins high diff
After the pain fight: Naruto wins mid diff
After mangekyo sharingan: Naruto wins very high diff
Start of war: Naruto wins high diff
After receiving SO6P powers: Draw