Well, both epub and Mobi ebooks are designed for text presentation, and not focused on layout. If layout is your primary concern, then yes PDF is the best output. Useful on computers and tablets, not so useful on the multiple other devices first mentioned in the original post. That is too bad. I suspect that using the "automatic" epub output is your failure in this.... it would necessarily take more work than clicking a button to "convert". Tables and charts can be added in as inline pictures, or even placed at the back of the document and linked via clickable links. But again, this will take a little more work than your company seems willing to do.
Vic
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