What's wrong with spoilers in this section of the forums? Anyway, unless Sasuke's technique is at all dodgeable, Sasuke's technique own's Naruto's. However, techniques are situational things. It took Sasuke quite some time and set up to gather the energy necessary to pull that off. It takes Naruto a set up to get off that rasengan, but no time to make it. Not to mention it took a lot of Sasuke's Chakra to even set that technique up. If Sasuke's technique fails for whatever reason, that's the end. If Naruto's fails, as in doesn't hit, he can try again. I really don't see anything surviving a hit from that. So I actually prefer Naruto's technique.