system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Are force ghosts more powerful than force users?

When Ben died, he said he’d become more powerful than you can even imagine. What did he mean by that? Could ghost Ben defeat Darth Vader if he wanted to? Can force ghosts even physically affect anything in the real world?
gpt
Yes, from a certain point of view.  
It's in what he said.  More powerful than you can imagine.  Vader can imagine a lot of power of a certain kind.  He can imagine bending the whole universe to his will via the Force.  
What becoming a Force Ghost grants you is something different from that.  It's a different kind of 'power' that Vader wouldn't recognize or understand.  Neither would most of the rest of us.