The "best format" can mean the one that's the most capable and flexible. Or it can mean the one that's most useful to most people. Or it can mean the one that's most readily available. For me the best format is mobi because I usually read with a Kindle.
The thing is, though, that "open" has little meaning in this context since all nearly ebooks are closed with DRM regardless of format. So to say epub is more open, while that may occasionally be true, is usually not true. It is true in the sense that any ereader can be made such that it supports epub, but that has little meaning these days. The majority of ereaders support mobi, at least in the USA.
I'm not advocating for either format. This whole thing is a mish-mosh and is getting worse. We'd be far better off if all ebooks were published in some common unlocked format such as HTML 4 or RTF, but that's not going to happen. Instead we have 2 major formats, both of which have excellent device and app support and being afraid of either of them seems to me more dogmatic than practical.
Barry
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