If you love doc formatting, PDFs made for the 6" screen are best. (And if you only love doc formatting a little bit, making PDFs of your favorites is fun.) Otherwise, ePub is most readable. LRF is likely to become a legacy format soon, and it doesn't allow the options that ePub does. But if right-justification is crucial to you, LRF is best for now.
RTF is "good" only in the sense that it's *fast*: I can copy the contents of a webpage into Word, raise the base font to 17pts, and throw it on the Reader in seconds; everything else takes considerably longer, which I don't always have time/energy for. But that's very much "I just want to read this; I don't really care what it looks like (but I need to keep the italics and author metadata)".
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