I actually prefer QOwnNotes. Its main store is markdown files on disk, unlike Joplins database, which makes syncing easy (at least for me, not separate webdav needed). Obsidian is very nice too, but startup is a bit on the slow side, whereas QOwnNotes is instant.
I've used Zim before, but it has no mobile clients and its custom syntax means I can't just use e.g. any Markdown editor.
I'm liking Joplin a lot better, although the rich text editor will get weird every once in a while. I'll switch back and forth between Markup and rich text depending on how lazy I'm feeling.
Might have to give Obsidian a whirl.