Not sure what "books" you have in mind -- not real e-books (EPUBs), I believe? Because those are completely fluid and are not made for any particular size of screen. And for me, the larger the screen, the better.
For fake e-books, meaning PDF files, you are of course correct. The 3:4 ratio is far more appropriate than 10:16 or 9:16. One of the biggest strengths of iPads as opposed to typical Android devices, I believe, is their 3:4 aspect ratio.
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