Sakuya has infinitely higher AP with volume scaling, is likely infinitely faster, and outhaxxes to an absurd degree (half second time stop vs infinite time stop, time acceleration/deceleration, EE, age manipulation, spatial hax, limited time travel, density manipulation, and summoning copies of herself from alternate timelines).
I don't think Hit has even a single advantage in this fight, and while he can oneshot, Sakuya is way too fast to get hit and has 3 separate options for killing Hit. It's not even remotely close.