All other things being equal – do you prefer used books? Or new books? (The physical specimen, that is, not the title.) Does your preference differentiate between a standard kind of used book, and a pristine, leather-bound copy?
If it has the requisite number of pages, isn’t falling apart, and doesn’t have an unbearably hideous cover, I’ll read it.
Okay, I’ll admit pristine new books are nice. There’s a certain thrill in holding a beautiful new volume and knowing that it’s only mine, that no-one else has owned it before me. But I also like holding a second-hand book and searching for traces of previous owners and wondering how it came to be in need of a home.
Aesthetically, I love second-hand books for the variety they bring to my bookshelves. Row upon row of matching new volumes would look boring; a mix of different vintages is charmingly eclectic.
Also, the need to give a homeless book is a really good excuse to buy it...