Is it because of the time limit? I know VOTE Sasuke wins without a doubt, but sometimes I find it debatable for pre Vote Sasuke. I would really like to know how you think he wins. I think he should too though.
Pre VoTE Sasuke beats him too.
-His Susanoo>>Kakashi's Susanoo. Kamui Shuriken are evaded with ease considering Amenotejikara can be used in conjunction with Susanoo, that also means that Kakashi's Susanoo gets blitzed by Sasuke's. Due to Kakashi's Susanoo having no kind of feat or hype or logical reasoning that'd prove it's on par with Sasuke's, along with the fact that half of Hagoromo's Chakra>Portion of JJ Madara's Rikudo Chakra, pretty sure Sasuke would tear his Susanoo apart.
-Sasuke blitzes with Amenotejikara and finishes him off. If Kakashi tries to strike, he'll be tangible, allowing Sasuke to finish him, if he's using Kamui Raikiri, he'll be intangible in all areas except his hand, which Sasuke can strike. Won't kill him, but it will definitely cripple him.
Kakashi has no way to finish Sasuke off. Kamui is evaded. Susanoo is obliterated, and Kakashi can't attack Sasuke with anything but Raikiri unless he wants to get bifurcated.