Disadvantages of books:
- Take up space.
- Hard to search effectively and to copy selected matter from.
- Almost always cost something to obtain, whereas electronic copy is sometimes given away or accessible at no charge through institutional databases, etc.
Advantages of books:
- Long lasting.
- Easier to bookmark for the very long term. (Finding an old bookmark in a book is often an unexpected gift.)
- Three-dimensional material form aids kinesthetic memory.
Upshot: Even when I have only the PDF or HTML copy of a book, I often print a chapter or section to read from, mark up, or tote around to read outside.