you're going to get as many answers to this question as people you ask. it is simply a matter of personal preference and usage. there are no studies proving one display type of sufficient quality is better or worse than another when used under proper conditions. what you will find is some display technologies have some advantages over others. eInk has great visibility under direct sunlight, but is useless in a dim or dark room without a backlight, the IPad's LCD has a much faster refresh rate and doesn't suffer from ghosting.
my suggestion, figure out what conditions you will spend the majority of your time under, choose a device that works well under those conditions, and try and demo it for a few hours or days if possible (beg to borrow a friend's device). it is the only way you'll know if that device is right for you. if you can't, try to buy from a place that has a generous return policy.
good luck!
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