Topic on Forum:Wiki Talk

Or they could just use spoiler tags.

I guess I mean I want to see more arguments here.

Usually this has just happened on a case-by-case basis. You mentioned Sailor Moon, but the anime and manga happened more or less simultaneously, and they're both on the same page. Sailor Moon Crystal has its own page though, because User:Looney Toons felt like making one.

Ultimately, it's going to be some kind of of balance between duplication of work, and desire to organize. I'm lazy, but if you feel like organizing more works, go ahead.