I find that I learn more from books than any other medium. I think it's because of the process of writing a book. It takes extreme dedication, passion, and a deep knowledge of the subject. Most books I've read have been reviewed by multiple experts and their content is presented in a structured and comprehensive way. Authors spend a significant chunk of their life writing a handful of books, many books you read are someone's greatest life achievement.

If the same amount of time and care were put into, say a YouTube video, I'd prefer the video. But that's very rare. My reading is 100% informational however, so I am biased in that regard.