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.

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