Which eBook Format Should I use?
Generally, we simply recommend ePub 2.
ePub 3 expands ePub 2 on multimedia, but has little improvement on book itself. After all, ePub is a standard for book, not audio or video. If you have no audio and video content, ePub 2 and ePub 3 are almost the same.
And ePub 3 is still poorly supported by devices, even already several years after it's released. Please see the poor status of support of ePub 3 the figure below,
Frankly, the logic of ePub 3 is absurd. E-ink devices is the most important part of reading devices, and most of them have no ability of showing video or playing audio, then what's the use of ePub 3 here? It's true that tablets can show these new features of ePub 3, but tablets also support Apps, what's the advantage of ePub 3 over standalone Apps?
So if you are a serious ebook publisher instead of geek, and you do want readers can read your book, you should choose ePub 2.
That depends on what type of your book is. But till now, fixed layout ePub is not fully developed and well supported. Even your layout is fixed, but screen size and readers demand are various. So prudently, if you want your book has a static view we recommend you choose PDF instead. Because PDF is a mature format and supported nearly by all devices, so why fixed layout ePub?
For most common book, standard ePub is enough. The idea of publishing should be changed because the basic reading bearer is changing from paper to screen. Predefined layout is a concept of old time of paper, and now the layout should be allowed to be customized by readers, such font face, font size. So if there's indeed a need of keeping original static view, give your readers the freedom of layout is a key idea of e-publishers.
ePub Maker doesn't provide ePub 3 output nor Fixed Layout ePub output.
Different from ePub 3 to ePub 2, KF8(Kindle Format 8) improved a lot over KF7(old Kindle format). Font size system, font faces, tables, positioning, all improved. Now in KF8, tables and images can be rendered correctly, so KF8 can be used on most books including all kinds of illustrations, while KF7 can only be used on books composed of text, such as novels.
And KF8 is well supported by most Amazon devices. On ePub, standard goes far away from implementation, while on Mobi, the standard design and implementation are well coordinated, the format add features that their devices can support, and devices rendered properly what they designed in the format. KF 8 can be supported on even an old Kindle 3 (Kindle Keyboard). So KF8 is a very great and practical improvement. We recommend your to adopt KF8.
The only problem of KF8 is that your mobi file size will double, for Amazon put an old Mobi file inside KF8 file for compatibility on old devices.
Mobi Maker 2 outputs KF 8 (with KindleGen 2.x recommended).