I am also searching for an alternative to Obsidian, that also works well on iOS and macOS. Obsidian is currently really slow somehow although all extensions are disabled, e.g. rendering the content when switching between notes is not instant. I really really like Outline, but I don't want to access the web just to write and read notes.
Just solved my problem. The slowness came from using iCloud Drive. It removes my notes / unsyncs my notes when I don't use it regularly. I have to set the Obsidian folder to "Keep Downloaded" and then everything is fine!
