Well why the hell did Vader deserve redemption? At least Kylo had layers, some obvious conflict. The great thing about the TROS version is that Kylo’s redemption was a by-product of what was going on. Rey was on mission (both in the DS wreckage and on Exegol) and Kylo’s turn around came about as a consequence of their interactions (and Leia’s death) - not just a matter of Rey throwing everything aside to win his heart. Luke’s entire focus on DS II was saving Vader when he should have been fighting the Sith with every last breath. The idea that Luke became some kind of legend for this is absurd to me. So I absolutely prefer Kylo’s redemption over the cockamamie “Vader was really just a nice dad and you should always support your dad” thing of ROTJ.