If I am taking notes in a client brief for a new project that we need to work on, I prefer taking them on Diary with a regular pen, nothing fancy. This gives me the flexibility to scribble and sketch, make connection b/w related features/functionalities/requirements. I can visualise the interactions, put them on paper and discuss more on them. All this is a lot faster compared to types out stuff on note taking apps.
When I need notes, like the to-dos, implementation details to be shared with others, I prefer Notes app on mac. Its easy to use and provide basic markup like bullets, heading, etc.
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