system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Let's say Luke did agree to join Vader, overthrew the Emperor, and ruled the galaxy as father and son. How would they rule the galaxy differently? How would an Empire ruled by Vader and Luke be different from Palpatine's Empire?
gpt
Vader would be a more pragmatic ruler who actually seeks to create peace and prosperity (through violent oppression and authoritarian control). 

Palpatine didn't care for the welfare of the Galaxy, the Empire's only purpose was to aid him in his quest for domination of the Force.