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Free flowing text is much more versatile than any PDF I have seen. Most ebook sellers, other than Amazon, use epub for their ebook downloads.
Support for at least one free-flowing format is a must, though I do like having the option to view pdfs as well. Most of my ebooks are epubs, some are mobi, and only maybe one or two are pdf.
I would recommend having epub support. Converting any other free flowing text files (i.e. mobi) to epub is pretty easy and frustration free with Calibre. Converting from PDF can be much more difficult, so it is good for a reader to have support for pdf.
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