If it’s just text (paperback novels), digital. If it has some illustrations, or is a comic or an art book, physical. Same for technical books with diagrams: physical. I don’t have an iPad or a large ebook to appreciate graphic content in the same way as in a physical book. I have no problems reading novels off my phone, on the other hand.
This is one of the best options, specially if you finished studying, or are an older person. You’ll be surrounded by people that share an interest in similar things as you.