For me there's nothing that beats the experience of actually having a book in hand. Call it a euphoric feeling, but I consider it a feat reading a book from cover to cover. When I read online or a kindle it reminds me of reading a blog article. It's not a bad thing, but if your anything like me I usually skim and try to find the actual point so you don't feel as invested in the information. As a designer I tend to appreciate the make up of the book design. I'm a visual person so the colors, the dimensions and even the nuances such as folio elements all help create an experience for me to visualize the story and follow through the book. So if I had to choose I'm for printed books.