Pencil and notebook for most things. I can think clearer, and if it's a list or something, I can rip it out and keep it on my desk.

Notepad++ for quick, disposable notes, drafts, etc. I just open a new tab and start writing. Tabs are automatically saved somewhere and will reopen with the app (I have a personal goal to hit the max).

I don't often refer back to notes nor can I stick to any sort of "system", so this approach works well for me.