I can vouch for the iPad + Apple Pencil + GoodNotes combo. I‘m using this multiple hours a day for university. The iPad also would be the most versatile device for watching a movie, playing a game etc.

You can also get other tablets but in my experience the writing experience isn’t as good as the iPad.

If you want to do mostly reading, an e-ink display will be nicer on the eyes, but you loose general functionality.