I love Obsidian. It blows away every other notes app I've used. I use it seemlessly across Android, iOS, Windows, and Mac devices. It's as customizable as you want it to be, even if that means "not at all".

I've set mine up with all kinds of templates and automation to populate and organize my daily notes, notes on books I've read, notes about people I meet, project notes, the list goes on and on...

And if I ever decide not to use Obsidian any more, all of the notes are stored as markdown files on my device(s). So I don't lose anything. Not even the formatting. Just make sure to back up your vault, in case you lose the device itself.