I'd say about 3/4 paper books and 1/4 ebooks. If I want to keep and reread a book, I get a physical copy. If the price is right and it's not something that I must keep, I'm more apt to get an e-book.
One thing that holds me back from getting more ebooks is that when you have a paper book, it's yours. An ebook can be yanked back and you're really renting it (long-term) but don't own it.
If the price is almost equal, then I'll go with a paper book.