I honestly prefer books instead of PDFs or print outs, but since I am oversea all the tax and postal is going to cause the price to skyrocket if I want to see it in stores. As for online stores my problem is impatience. I cant wait the month it is going to take it for the book to reach my little home, especially where I am atm, so I buy the PDFs.
I did vote for the books though, since they are better imho