i use a laptop for lectures and tutorials. i have to for disability reasons, but before my disability i used pen and paper and there's no comparison for me - using a computer is SO much easier. i have everything i need on there, so i can cross-reference notes in the middle of a lecture or tut; i can look up things in the middle of a lecture or tut; access the lecture materials/slides online if i need to whilst making notes in the middle of a lecture/tut. i also type much faster than i write, and i find it easier to make presentable notes on a computer. if you have a lightweight device, it's great.
i've never tried using an ipad - plenty of people on my course use ipads with attachable keyboards, and it seems to work for them, but for me the screen and keyboard would be too small (disability means i need to use a full-size keyboard).