zentangle, quote, Nook or Kindle?

"Books are the bees which carrry the quickening pollen from one to anothers mind."  - James Russell Lowell

For several months now, I've been thinking about purchasing a Nook or a Kindle.  Most of my friends have the Kindle Fire and really like it.  However, when I go into Barnes and Noble they have a pretty convincing spiel about their Nook.   I can't seem to make up my mind -- any suggestions?