I prefer mobi for the one feature that is a priority for me (and I recognise the notorious subjectivity of this priority): user-selectable, purchasable dictionaries for dictionary-lookup (I know this is not any meaningful priority for some, if not many, but the poll is about personal preference, and it's a priority for me).
Of course, if epub have brought this into their standard now, my preference will be made moot (I'm often inattentive to technical developments when the technology I have is satisfying my needs). Aside from that dictionary feature, my preference would me mild-to-non-existent, likely tending toward's epub's capabilities and future development of the standard but pared down by Calibre's easy "swiss-army-knife" conversions.
Cheers,
Marc
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