From my experience using a non screen tablet makes the learning curve much steeper while a screen tablet feels much more natural due to people being used to seeing what they are drawing from writing and drawing on paper.

I have seen this one some festivals where they set up a couple Wacom LCD tablet devices for people to draw on - there was a lot of interest and basically everyone was able to start drawing in a couple minutes. Seeing what you are drawing on the screen and not in front of you basically throws all the muscle memory people have from paper drawing and writing out of the window.