Hardcover books are my favorite, but paperbacks are alright. I dislike E books, though. I mean, they're convenient, but...for some reason having an actual book in your hand when reading feels much better.
[b]E-readers[/b]
Adjustable font size
Adjustable contrast / colours
Backlight
I can read and be comfy at the same time
Lightweight
[b]Physical Books[/b]
Smell nice
Look nice on a shelf
Give you the ability to look sophisticated from afar