I was using Joplin for a while... Self hosted their server. On two occasions it screwed up on me and wouldn't load my folders... Luckily I had backups but it was still frustrating. I don't recommend them purely because the notes are stored in a custom format instead of just plain text files.
My favorite way of doing notes now is with git, currently using a free private repo on gitlab.
Just clone the repo on whatever PC I need them and it has backups and version control.
yeah, just looking through the notes, it looks like both devs care a lot about their project and just have different visions for what a "Complete" notes app should look like. It's nice to see, because sometimes when you see a fork of a project it's because someone abandoned it or there is some kind of community drama, but that doesn't seem to be the case afaik.