ppi (pixels per inch density)
higher is better for crisp text. 200+ is desirable, 300+ ( aka retina quality) if you are fussy
size/weight to suit you, and think through how you will hold it to read : portrait, landscape... which hand fingers/thumb will initiate page turns, will you prefer tap or swpie and where on screen do you prefer to tap... then you will chose a reader app that works for you.
Some apps ( but not the kindle one) let you customise what screen areas are used for what functions
e.g. I like a large tablet set up for 2 column landscape mode in reader apps. I read propped up in bed with tablet resting, balanced on me so for me, the weight is irrelevant
I have both left and right screen edges set to go to next page- so I can use either hand. the less used go to previous page is mapped to centre top. that is in Moon reader pro
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