It depends on whether the bring you pleasure in some way shape or form. They do me, each in their unique way, and that’s i don’t have a favorite. They are like my children. I can’t compare them.

Most of mine are in digital form, but I have a few physical copies of stuff I've picked up at airports over the years. My favorite is "The Silmarillion" hardcover, it's a prequel to LOR and includes a lot of backstory to some of the lore, including maps and other illustrations. Tolkien's son co-authored it, as he died before it was finished.

I was looking for a book from my childhood that I wanted to gift my niece - “the talking parcel.” I discovered new hardcover copies go for ~$300-$1000.... ummm... why??! Just found a used paperback with the alternate title “the battle for castle cockatrice” for $15.

Not economically - they depreciate massively unless they are first edition or leather bound. But it can be a good investment into yourself.

No. I read at random

Not the book but the content is a good investment in your own soul ;)

On one hand it's nice to have a physical copy since you never know what will happen to your digital device and the cloud, and also a study showed we retain information better when we read from a physical copy...on the other hand I think a lot of people (like me) keep tons of books they'll never read again and it's a waste of resources.

I'd have to look through my whole collection to remember what all my favorites are, but one good one I saw hanging out on my floor is The Examined Life: How We Lose and Find Ourselves. Other than that the ones that come to mind first are all the books in the dialogue series by Neale Donald Walsch.