I do feel like DoTF is more fitting thematically, though. If it’s just the same song as the one from TFA that doesn’t really tell you anything extra. Them fighting is just an elaborate spectacle for Kylo to get Rey to tap into the dark side again. Sure, the track from TFA makes those parallels more apparent, but I’d much prefer the track to add another level of interpretation to the fight.

Consider that Rey has had a vision of herself on the Sith throne. And the end result of the fight is that Rey thinks her fate is inevitable. Therefore, I think it’s extremely fitting to place a track called “Duel of the Fates” over top of their fight. Especially since their duel also leads Kylo to reconsider his destiny and he chooses to become Ben Solo again.