When they both were in booster forms, Naruto wasn't owning anyone. Exactly what fight were you watching? Sasuke went CS2 and Naruto went 1 tail. After that, they both went for their signature moves, and only one was left standing. At that point in time, Sasuke > Naruto. CS2 > 1 tail.
Sasuke + CS2 > Naruto + 1 tail. It's how it went down. That is fact.

@Naruto needing to be in 1 tail mode to fight Base Sasuke.
Edit: Yeah, it was Rasengan vs Chidori. It wasn't that Naruto missed, his Rasengan hit head to head with Sasuke's Chidori.
It looked as if Naruto's Rasengan just kind of got over powered, and then he went to scratch Sasuke's forehead protector. Looking at the fight just now, there was not one point in time where Sasuke was in any real danger for his life. Hell, Naruto was forced to go 1 tails while Sasuke was in regular form.