Although not ideal, I ended up with OneNote. Also for temporary notes, I use Trello (easily accessible from my mobile), but the notes don't live there for more than a week.
I like how many people advice to build your own system with git and markdown. Ideally, I want such a system to work quickly on non-cutting edge mobile and sync on the fly, so maybe that's an idea for a side project.
To all the lovers of OneNote: doesn't it bother you that printing the notes / pages (physically, or to PDF file) provides a sub-par experience? Writing notes in OneNote is great, including managing them... unless you want to print a page to share the notes to someone via another medium. Than it just annoys me, and I wished that I'd started in Dropbox Paper or Google Docs.
Although not ideal, I ended up with OneNote. Also for temporary notes, I use Trello (easily accessible from my mobile), but the notes don't live there for more than a week.
I like how many people advice to build your own system with git and markdown. Ideally, I want such a system to work quickly on non-cutting edge mobile and sync on the fly, so maybe that's an idea for a side project.