I've tried using the notes app on my iPhone but it's just not quick enough to write things down in - although that might be because I have a 5s with a smaller screen than newer phones. I've used it when I have been without a pen a couple of times, but other than that I have very little use for it.
I think I used Evernote once and it just seemed like an early-2000s version of one note.
Ideally what I want is MediaWiki in a .exe or .app. Most other wiki programs seem to be inferior to OneNote for me, but I'd love to have my own offline Wikipedia of my life and projects.