I actually think Asuma takes this. Hidan would never be able to finish his ritual even if he draws blood. Hidan may be a bit faster, but Asuma has the weapons advantage. Unless Hidan's scythe is special, which it's never stated to be, Asuma should have no problem cutting it apart. Asuma might get a few cuts and hits here and there, but eventually Hidan is going to lose all his weapons. I can't imagine Asuma getting punched to death so yea, Asuma wins this.