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?
Interesting question. The truth, for me, is that I just don't care. I have more paperbacks than hardbacks, because they're cheaper to buy. I find hardbacks heavy and unwieldy to hold up for too long. So I would probably have a house full of paperbacks.