Fandom - anyone can write a page, leading to a lot of bad pages that get taken down quickly and a community mostly composed of young children, creativity is a lot easier because of the loose lore and rules. The mods aren't particularly abusive for an online community.
Wikidot - Writers must be verified, so the writing quality is generally higher. The mods kinda suck though, so a lot of the best writers in 2021 moved to Liminal Archives leaving the Wikidot with ok at best recent levels. This by far has the most lore out of any wiki since Fandom pages contradict each other leading there to not really be an official canon.
Liminal Archives - Newest Wiki, generally great writing quality, pages take a ton of verification to get published so there aren't as many pages as Wikidot/Fandom, drastically different lore