Hard copy books and still the best, despite the fact that there are many reasons why one may want to prefer e-books.
Firstly, e-books can easily be replicated, making sharing it much more easier than hard copy books.
e-books are equally readily accessible, and are easier to create.
However, because we usually use e-books on phones and other tech devices, one is always prone to distractions as there are many things that can call one's attention when reading an e-book.
Also, gluing your eyes on screens are bad to eye health.