I ask the question of physical or digital because I want to know whether you like your books physical (meaning you can hold them in your hands) or digital (meaning you can access them from some electronic device). There are pros and cons to each, and each person has his/her own reasons for their decision.
For me, I initially like digital books. The reason is that I can get them free or cheap. However, if I like a book, then I will definitely order it in physical form (if available) so I can have it for later use.