Many devices read PDFs directly, so you are better off just leaving it in that format if the devices allow and it isn't unreadable because of multiple columns, etc.
There are few devices that will display epub 3.0, so identify your target device and make sure of its limitations before you spend a lot of time making a beautiful compliant epub that the device can not fully use.
Right now, this is the bleeding edge, a fascinating, but sometimes not so pleasant, place to be.
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