I use a notebook with a pen and something roughly corresponding to the bullet journal format. Portable, power outage safe, hard to steal remotely and easy-ish to slot into the legal process if required.
I like the Uniball Vision Elite with the bold point in blue.
I've run out today and am reduced to a US Government Skilcraft pen. A decided downgrade
I choose physical notebooks over digital because it's easier to go freeform when needed and you don't need most of what you think is important at the time.
Started about 7 months ago and use it daily. I got a black Leuchtturm 1917 for work, and a white one for personal.
I used to keep daily notes in a Dropbox folder, edited and searchable with Sublime Text, but the physical notebook is much better.