I agree with Wallcraft that TOPAZ appears to be a format with more possibilities.
So, we have to distinguish between (i) format capabilities (what theoretically is possible with any given format); and (ii) specific implementations within the given format's limitations.
The best topaz book (images, fonts, etc.) should look better than the best mobi/azw book. Yet, often specific mobi/azw books look better than topaz.
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