If you want it to be easy on your eyes you need an e-ink reader. Tablets use LCD and the constant staring at them that you do while reading causes a lot of people to have eyestrain. Some people aren't bothered by this but many are. Also you can't easily read a tablet outdoors. E-ink ereaders can be read as easily outdoors as indoors.
That said, e-ink ereaders, the good ones, don't meet many of your other criteria. They do have long battery life but that's about it. I charge my Kindle Paperwhite on Saturday whether it needs it or not. My tablets need to be charged after a day of use, or less.
E-ink ereaders no longer have audio. There are a few cheap ones that do but the reviews say they're pretty buggy. If you want audio you need a tablet or an older model ereader.
My suggestion is to get an e-ink reader for books and a tablet for everything else. I prefer the Kindle but I also have a Kobo Aura and at one time I had a Nook Simple Touch with Glowlight. I think the Kindle is the nicer of these devices but they're all okay.
The real difference, to me, is the stores. Amazon's books cost less, as a rule, than either Kobo or Nook stores. Kobo is quite a bit more expensive and Nook is a little more expensive. Given that and that the Kindle has a better screen and adequate features, all of which work better than corresponding features on the other devices, it's my reader of choice.
However, if all I had was the Kobo or the Nook I'd be perfectly happy with them. They're very good devices, too.
Barry
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