The thing is writing on a tablet (or an iPad from my experience) isn't as easy as you would think. You have to write on the iPad with a stylus without resting your palm on it, which makes it hard to write fast. And it's not as sensitive, so the writing comes out really sloppy.
I also like to write on diagrams, draw arrows, etc., so I actually printed out my notes for the first half of the year. But I've switched over to the laptop to save on paper and printer ink. I have a macbook, so I just edit the lecture PDFs on Preview. It's really quick and easy to add text boxes anywhere you want on the slides (so you can label any diagrams, put notes next to relevant points, etc). You can even quickly add arrows, underline, highlight, circle things, etc with one or two clicks. And it's actually more efficient since I type way faster than I write. But that's just me.