They're practically the same, but one is kid friendly

...WHAT THE F**K. HOW AM I EVEN CONTUBLATING THIS?!

Theory: Bill Cipher is on the same level of power as Vecna. (is that how you spell it?) Both can only appear in hallucinations or dreams. Both lure victims into their trap through hallucinations and dreams by either taking the form of a person or possessing a person. Right?

Yeah. And that's how you spell Vecna.

ok great