smart_jackal wrote (edited )

CHM and AZW3 are also probably bearable. You shouldn't be able to notice any remarkable difference with a good ebook reader. The difference between all these formats and PDF is that the latter is primarily meant for printing, not reading. It also means that page styles, table of contents, etc. are hard coded within the document instead of just defining the contents and leaving presentation for the reader to handle (as happens in case of epub, mobi, chm, azw3, etc.).