All other things (like price and storage space) being equal, given a choice in a perfect world, would you rather have paperbacks in your library? Or hardcovers? And why?

This is a tough question, as I love both.  Paperbacks are eminently portable, but hardcovers are so much sturdier.  Paperbacks sometimes have a greater sense of history, but hardcovers smell better.  In a perfect world, I’d have each for its appropriate purpose.  Fancy editions (Complete Classic-Author, for example) would be hardcover.  Longer books would be hardcover.  But quick reads would be paperback.  Guilty pleasures, also paperback.  Plays, paperback.  But I certainly wouldn’t want ALL my books to be paperback.

What about you?