@teekayyye since I'm not in the Mac environment I can't help much, though I set up my own system.
I have both on the phone and PC a markdown editor. All my notes live in a git repository that I push back and forth.
This approach might be a bit too technically for most individuals. It has the benefit that it is independent of any one technology and thereby future proofed.
@barefootstache that is very true. So many softwares i tested just didnt make it over the years to receive further support.