I use Apple Notes because it’s free and always on my devices. Used EverNote in the past but then they started charging. I bought an iOS app but they went to a subscription fee.

Personally, I’d prefer a Markdown with Github integration. I moved some of my notes to Github in .org or .md format:

https://github.com/melling/MathAndScienceNotes

https://github.com/melling/LanguageLearning

Save your notes to Github and use Markdown so people don’t feel locked in.