Now let me tell you this. The Nook SUCKS I had one and it broke now the nook hd+ might be better than the nook color but I doubt it. The charger broke and it's been breaking on tons of other people worldwide. And A lot of them have been having a little screen problem that comes over time Where you can't do anything basically because the screen blurs everything out.
The Kindle Fire isn't that awesome.
When I had my hands on a ipad it was very slow but then again there was a lot of stuff downloaded on it so that is probably why.
The samsung tablet is probably the best tablet that I've had hands down. If you were trying to select an tablet out of this list you should probably go with the samsung tablet or probably the ipad. Just DO NOT get the nook or Kindle Fire.