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AMOLED is just looks a little prettier, shorter life than LCD as it's not real LEDs, but electroluminescent dots that are like diodes and emit light. They need phosphors. Real LEDs are available in true R, G and B, but a real LED screen costs 1000s. Sony calls it Crystal LED.
The iPhone is a walled garden and massive profit margin for Apple. They are harder to replace batteries on, on average and the supposed better quality and ease of use is marketing.
Basically you need a tablet for PDF and any 6" Android phone is good enough for real ebooks (epub or Amazon via the Kindle App).
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