[workthrowaway]

both dystopic and dystopian are synonyms.

btw did you know that grep (as in the unix tool) is in the dictionary? it even says it comes from the operating system.

[onreact]

"Dystopic" [sic!] may lead to misunderstandings. Also the article above states that it isn't an actual word.

You can't even pronounce it. People will only hear "this topic" or something like that.