I moved from Joplin to Obsidian pretty much only because Obsidian has all the files as regular files.

Joplin has its own weird-ass database system.

It was also really janky 4 years ago when I used it, might've gotten better since.

I tried both and am using Joplin. Has less fuss around it and I focus more on simply taking notes .. the syncing is also cheaper and you can use for work

I've been using Joplin for over a year after spending too much time testing all of the options out there. Joplin's syncing sealed the deal for me, free and it works well. Obsidian was something like $100 USD a year just to get things synced to my phone.

I've tried both. No UI issues to complain about in Joplin. But Obsidian seems to use its own style of title bars, and it uses the GTK file chooser when my OS is using KDE.