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Epub2 if you want widest compatibility with all ereaders, apps, Amazon, Google etc. The epub3 has features for multimedia perhaps best done as an App for iOS and Android that won't work on most eink and most ereader apps and won't be accepted in upload to Amazon for publishing.
There are a few features in epub3 that are OK for novels and may work. But for a straight novel / fiction even with illustrations the epub2 is fine and is preferred upload to Amazon, Smashwords (who send it to Apple, Kobo, Barnes & Noble etc), Google PlayBooks etc.
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