Although I prefer reading on devices with a 3:4 aspect ratio myself, it’s perhaps worth noting that the 9:16 or 10:16 aspect ratio of most Android devices is actually far closer to the aspect ratio of the page of a typical paperback book. The traditional paperback has a page that measures about 10x18cm.
Where 4:3 really wins, as several people have already noted, is reading pages “2 up” in landscape mode.
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