I’ve tried nearly every major app/service and always end up on Standard Notes. It strikes the perfect balance for me between privacy, ease of use, and functionality.
Prior to settling on SN I was a big fan of Simplenote and nvALT, but the lack of even basic MFA for Simplenote drove me away.
Evernote, OneNote, etc just seem to be way too much for what I need. And Apple Notes, while it has gotten a lot better, does not make it easy to get your data back out.