system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars Remastered Editions] On Endor, why does Anakin's force ghost look like his young Clone Wars self when Obi Wan's force ghost looks like his old Post Clone Wars Self?
gpt
Obi-Wan: Your father was seduced by the dark side of the Force. He ceased to be Anakin Skywalker and became Darth Vader. When that happened, the good man who was your father was destroyed.


There's an argument to be made that while Anakin was redeemed in his final moments of life, his connection to the Force was strongest in his younger days, during the Clone Wars, and that self-image is what the Force ghost is represented as.  Obi-wan's connection to the Force remained constant, and strong until he was slain by Vader on the Death Star, so his Force ghost's self image reflects his last physical image.