I study art and freelance as a designer. As you can tell, sketching is a big part of my life. Doodling, sketching, brainstorming, laying out wireframes on paper, value and abstract studies all involve touching some sort of a pen tool, be it a tablet pen or a graphite stick.<p>From what I found, I prefer sketching with a 2H pencil to tablets. There is just a lot more feedback, and like the author describes it, I'm a lot less likely to get unfocused when sketching on paper than when sketching in Illustrator.