Personally I'd say more spontaneous, but you'll probably get others saying something else anyway, so just pick and choose at the advice until you find something that seems to work for you. Perhaps instead of taking the full thing in on a piece of paper, just bullet point the topics you want to cover, and just talk around them without sticking to a set script. Or if you feel this may still be too distracting, don't use any notes and do it off the top of your head, just make sure that you know everything that you're going to want to talk about before you go in. Whatever helps you best I guess.