Have never had a nook, but did research them. Chose a Kindle and love, love, love it. When I changed handbags and could not get my Kindle in my small purse, I syn'd it to my smart phone and am now in a whole new world. My phone has a backlight (naturally) and I am able to read in the dark if in that situation. I also have a book light on my Kindle...just doesn't work as well as the phone. Thought the screen would be too small , but after a couple of days, I don't even noticed it.
Did I say I love, love, love my Kindle.
diane