I adore Obsidian. Works on all my devices, options for self-sync, an amazing community of plugin developers.
I've found Obsidian to be the ideal tool for fiction writing, with everything you need to split up and organize, clear the screen and just focus on the words, and a ton of great plugins to make it the complete writer's package.
On top of that, Obsidian has pretty much replaced Notion for me, no small feat! I still love Notion, but Obsidian is so much more flexible, allows for multi-page side-by-side viewing, and is extremely customizable.
Can't recommend Obsidian enough 😍❤️