How is this even a point of discussion? Rey clearly beat Kylo Ren at the end of TFA. I mean, maybe if you were watching the film with your eyes closed you’d think that but the visual language of the film, the score and what was going on in the plot all point toward the pretty damn obvious fact that Rey won.
Go back and watch the Ali V Foreman fight from 1974 - the Rumble in the Jungle. If the earth had parted somewhere in the 6th or early 7th round you would say Foreman won the fight, but Ali’s plan was to let Foreman think he was winning and tire him out - the old ‘rope a dope’. Ali, it turns out was in complete control of the fight despite what it looked like.
Cleary Kylo went for the ‘Rope a Dope.’ Given Kylo is a direct descendant of a human from future earth he may even know the Ali story and used it as inspiration.