The Amazon Kindle is definitely a better reading device compared to the Nook. This is basically based on the features the two have that make them different. The Kindle has more amazing features and it has an improved background processing. This makes the turning of the page faster and it also has a built in Wi-Fi as well.
I prefer the Nook. My grandmother has it and I use it all the time. My father's friend also has a Nook and it is awesome. She gets magazines and books and such all the time and then she downloads games. She can also get books from her library over her Nook. Hope you make the right decision! (: