The best format is the one that allows you to use most of the features that are built into your reader.
PDF - Supports active TOC but does not support "Dictionary" or "Find"
The new JB firmware .35a supports Text Flow on/off - which is a big enhancement when reading PDF documents on a small screen.
ePub before JB FW .35a supported "Dictionary" and "Find" functions
ePub after JB bFW .35a loses "Dictionary" and "Find" function but gains active TOC and doucment supplied fonts just like PDF docs.
All other formats support "Dictionary" and "Find" functions.
Basic functions across the board are "Jump To", Bookmark handling, Recently Read list, Page rotation
Some of the other features are not supported under PDF and the new ADE ePub reader under JB FW .35a Font sizing, justification and selection.
John
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