I feel like his lose was inevitable, seeing as Naruto was destined to win
But I REALLY enjoyed the way he lost, not through death or bitter separation, but acceptance. I think everyone, including Sasuke fans, can be satisfied with that finish
I think that they should have fought at a later time, say when they both masters their own powers. But with the manga ending and all I just really think kishi rushed. Though the fight was exciting it was short and lacked a true naruto show down feeling. But eh that's just my opinion.
Op: it was a physical tie but naruto one the mental battle and changed sasuke a little. But they both won because together their plans of achieving real peace is possible as they work together to achieve it.
because sasuke admitted defeat. he went into the fight with uncertainty to begin with he's pretty much just changed his mind. the fight was pretty much a double ko bt naruto reached his goal, to end the fight without killing sasuke, so he pretty much wins. i wanted sasuke to win but, somehow i like this ending more.