No idea. To be fair Neji was the perfect match-up to fight him. He had the versatility, speed and the fact that if anyone else had gone up against up they would've died because they didn't have the Byakugan, the gentle fist being the only thing that could break the webs...I mean remember how it went with Naruto?
I don't really know or mind who wins out of that 1v1 because it does just come down to matchups, and Hidan can do nothing against Kidomaru. Just because A > B > C doesn't mean that A > C. You're just going by their presentation in the manga alone when really when you pair them up one clearly negates the other.