I am another that uses a Samsung Tab A (10.1 inch in my case as I read a lot of books with illustrations or are in pdf format) and see no reason for me to change. I do all my reading on that, I gave up on E Ink quite some time back. Samsung also do AMOLED display tablets which are very nice but they are considerably dearer.
I have an open mind as to make. I have used or tried Android tablets from the likes of well known manufacturers such Lenovo, Acer etc. in the same market segment as the Samsung Tab A and they are all fine as far as I can see. From what I have seen in shop displays many cheaper ones look jus fine for reading too.
Especially if reading at night I suggest using a reading app that allows one to adjust the screen brightness up and down with a screen gesture (commonly a downward swipe on the left hand side of the screen); much quicker and easier than using the tablet's own control. Being able to tint the background to ones imitation of white paper or other colour preference is also useful in my view. I use PocketBook (it has a strange but effective menu system that takes some getting used to) but I suggest trying a few of the better apps and making ones own mind up, despite what some may tell you only you can decide which is best
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