One writing that you'll choose for yourself and suggest me

Just saw a video of stationary awards and it got me thinking about what is one thing that you would personally use to write if you had to choose only one thing?

My mostly writing stuff is journaling or just random things to write. I am a college student and most of my stuff happens in my computer so what writing tool would you suggest me?

• A gel pen
• A fountain pen
• A ball point pen
• A mechanical pencil

And what would you choose?