Yeah, he won because his hand was larger...right.:laugh:
Sasuke did not win Naruto did not use his full potential because he did not wish to kill sasuke however sasuke had other things on his mind other than sparing narutos life.
The winner of a battle is the person who walks away from it. If the person held back then thats called a moral victory. But in the world of fighting, if your standing and the other guy isn't, you won.
Either way you look at it naruto would own sasuke in an all out fight and they fight more than two times i believe it is a total of five times that they fight and on the fifth time naruto breaks out 5 tails on sasuke and nearly kills him
Sasuke diffenately won. and if Naruto was holding back then he was holding back just a little. Naruto did say that if Sasuke didn't come back with him then he would break every bone in his body and take him back. And the reason why Naruto went for Sasuke's headband was because Sasuke had earier made the boast that Naruto wouldn't even be able to make one scratch on it.
Between Naruto and Sasuke,i reckon both are strong in their own ways.However by observing what is happening in the current manga,we can see that Sasuke now knows Naruto's secret and may prevent him from using it,which may force him to use his own strength.Naruto,is now working on creating a technique which may surpass the Akatsuki members and possibly will be more powerful than the 4th Hokage.It is hard to tell,but i guess weh ave to wait and see.