I personally believe the Kindle three or more to become a greater choice in the end. Each the Kindle a few and Nook have comparable book libraries with loads of free titles, but the Kindle is lighter in weight, lesser, and slightly less costly for each designs (WiFi and WiFi +3G).
The improvements in the Kindle three have systematically one-upped the Nook except for the color display screen and sharing capabilities, that are questionable benefits to begin with for an book reader.