on The Book Designer:
I ruffled some feathers a while back when I pronounced that a PDF isn’t an ebook, but an ePub is in my article, “What IS an Ebook?”
I really didn’t mean to cause a kerfuffle; I didn’t mean that ePubs are somehow better than PDFs, in all circumstances. I love PDFs. I love ePubs.
Which is better in a particular case depends on what purpose the file is going to serve.