I use Joplin for a simple notes app mostly for my phone but I do have it on my desktop and sync. What I do not use it for is my desktop notes collection which is a several thousand notes pages some quite big. I use Zim for that. It is a desktop Wiki.
I do not use Obsidian but it seems like knowledge base and linking is what people rave about. These are the ways in which I use Zim for example.