I use paper for all my “at the moment notes” it’s just easier because actually unlocking my phone and opening a note app then starting a note takes too long and a lot of the time I need to draw a diagram or something to go along with it. Anything important gets transferred into my onenote from the paper later on. I would like to find a good app to go completely digital but so far nothing I’ve found meets that need as well as just carrying a notebook around.