I can only tell you my experience with the Nook. I have it for a year and a half now and love it. That said, I only use it to surf the web in bed, or to download free reading material. People think I'm nuts not downloading a book from B & N, but I found the best reading material is free! It also has other apps you can download and this came with chess that I play once in awhile.
This thing can surf the web well, watch videos, emails even answer to this forum! My only gripe are two things:
1) since this is a touch screen, I often fat finger between two links and get the wrong link. But not to worry. At least you can accidentally go on the worst site with this thing and not worry about a "drive-by virus" like Microsoft gets since it runs the viral free Android OS. With Microsoft, you probably would fry your device or computer for the night.
2) I don't know how Kindle is, but Nook does not handle web pages with frames at all. Let's say a web site has 3 frames. It does not know which to scroll, so you only see the top of the web page, and you cannot scroll it down making the site totally useless. However, only inexperienced people use such web page designs and major, reputable sites are not designed that way. Back in my HTML class days, we were told this is a bad way to design a web site anyway due to the fact there are issues --- if one for example, google's such a site, they may come up with only one of the frames. It's sort of like meeting half a person!
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Overall, these are not major issues and in my "book" makes for a very good E reader--- My Nook book!