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I really like this question. I would like to see this data cross-sectioned by age, but also add Video as an option.
I greatly prefer paper personally.
In our Actuarial exam prep business, students seem to equally prefer paper vs. electronic reading material. Older exam takers, however, clearly prefer paper. However, we’re seeing that current college-age students are choosing video-only (no text) at about the same rate as choosing text (there is no required text for those exams so they have options). This influenced how we designed our video lessons for CFA Level I. They are quick, to the point lessons that appeal to the video/visual learners, which is an growing portion.