Epub 2 supports SVG just fine. ePub 2 is currently supported by more devices/apps, so you need to decide what market you are trying to target. More and more devices are starting to support ePub 3, and they can easily be made backwards compatible so those ePub 2 devices will read them. IIRC Sigil automagically creates the proper files for backwards compatibility??? So...there are fewer and fewer valid reasons to not publish in ePub 3... FWIW
Cheers,
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