There is also the fact that different sizes and types of screens are “better” for different types of material. A mono 6” eInk screen is great for reading fiction, but it’s a poor choice for PDFs formatted for an A4 or Letter page. A 10” screen is better than a 6” in terms of the amount of content displayed, but it falls down in terms of portability. Assigning objective measures to these factors isn’t possible because different readers have different priorities.
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