Bluefire or Aldiko Basic on Android 4.1.x phone with 4.3″ screen.
Lithium or Pocket book on later Androids.
A 4.7″ skinny aspect eink
A Sony PRS350 5″
Kobo Sage 8″
More people use the Kindle app on iOS than Apple Books. Also Apple Books is really only for ebooks downloaded from Apple, who change the epub a bit. Third party epubs are better read on a real iOS epub app.
We only extensively test if a new style is used or different sized images.
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Apple Books, Kindle previewer and Thorium
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Not representative of common use.The Kindle previewer is pointless. I test on real eink Kindles, a K3 and PW3 with a dual mobi (mobi/KF7 + azw3/KF8) made by Calibre. The Kindle Previewer only has a tenuous connection to reality. If doing a new style we would also download a published mobi, azw3 and KFX by buying it.
About 95% of English Language bought ebooks are now Kindle format.
Kobo uses kepub for direct to device sales and epub for sales downloaded to PC. If it passes epub checks and works on a kobo eink direct from Calibre as epub2 then kepub will be fine. The kepub renderer can do epubs by rename of the file. The kepub is only extra spans.
There are many kinds of epub3. A reflowable epub3 with epub2 TOC and no interactive content works for the most platforms/apps. Some kinds of epub3 won't distribute via ebook retailers and only work on a few apps.