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IMO a lot depends on what you want to read a file on. For reading on a PC or Mac the PDF format is versatile and the features of the Adobe reader are excellent. If you want to read on a tablet or E-Reader the choice might not be so clear and could vary depending on where you are. In the USA Kindle formats are the way to go as Kindle has the majority of the Ebook market and makes free reader apps for most common computers and devices from smart phones to computers. In other countries epub is probably the commonest format. For pure text it is hard to beat RTF or TXT files for size if you have a compatible reader or program.
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