I’ve used Joplin for obsessive note taking for a couple years now and am happy with it (after trying every other tool I could find). It lets me sync with my standard sync tools and being FOSS I know it won’t end up being a paid app down the track or get bought out and ruined.

Obsidian does have a slightly nicer UI and some nice features Joplin doesn’t have but I think the former points are way more important.