But the second question (not your topic question) shows that Nook is not for you. The galaxy will be the most open of the tablets you listed.
I bought a nook hd+ a few days ago. It's not for me; playing around with my dad's kindle, I found that I like to jump around form free app to free app, and play a lot of games. and the nook isnt good for that. I tried to figure out how to download 3rd party apps, but I didn't figure that out.
I guess I could return it, but a friend told me about his samsung galaxy tab, nnot sure if it is 1 or 2. His tab is 7 inch, the nook I have is 9 inch. I originally preferred the bigger screen, but I guess it doesn't matter, if I can get good free apps and games. I asked him if the apps you'd get were like the apps on kindle, and he said they were better. He has an ipad, so he's looking to get rid of the galaxy. Good deal?