I have a ton of friends who are VERY PASSIONATE on either side of the digital-analog phone debate. Many will argue that one is "objectively" the correct way to read a book in the modern era, and will attack the other side ravenously whenever the issue comes up. It makes for a lot of fun conversations!
Personally speaking, I prefer real books. I like having a bunch of stuff on my shelf that I can look up and leaf through whenever I desire, and, whenever I have anyone over, my book collection makes a lovely conversation piece. I have a lot of obscure, expensive books, so people tend to be pretty impressed – I'd rather show them that than some dumb anime girl figurines or shit old PS1 jewel cases. When it comes to the actual experience of reading, nothing really gets me more snuggly and cozy than actually turning the pages myself by the light of a window or late-night desk lamp. Plus, you don't have to charge the bloody thing, which is a bonus all on its own.
Then again, I've read several full books on both my tablet and just at a laptop, scrolling up and down the pages with my arrow keys like I'm playing Pac-Man. If I can't get a book physically, and the only option is to pirate a .PDF, then my tablet is probably what I'm going to read it on. (I use this cool Windows program called
Cover – it's great for reading both text and comics, and even has a "manga mode" that turns pages right-to-left!) I'd like to actually have the book in my hand, and I'm willing to spend money to get a high-quality version of it, but when that isn't an option, I just steal it, instead. Less competition for me as an author!