Both have their places. What is not good on the 505 are the older letter or A4 sized PDFs with fixed layout. They are almost impossible to read on a 6" screen.
Also, most PDFs that are custom built for the 6" screen come in a fixed font size. If you later want to increase the font size you cannot do this on the older PDFs. (I will sometimes need to enlarge the font size in lower light levels.)
I would favor ePub; but, many people are upset with the current Sony implementation that does not provide full line justification.
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