I would not choose the Nook. We got one for my DD for Christmas in 2011. It never did work well. She hasn't used it in ages. She uses her laptop or Ipod instead. We have 2 Kindle Fires and love them. I enjoy reading and watching TV/movies on mine. DH loves his for reading and playing the apps. I mostly use the kitchen table for my sewing and will prop my Kindle up and watch things on it. We have a wireless internet router that the Kindles use and also have Netflix and Amazon Prime.
If you use Amazon a lot, the Kindle will give you a free trial of Amazon Prime. On many, many items you can get free 2 day shipping. We use it for everything!! And you get free streaming from their video library. Not as much as with Netflix, but worth it just the same.