The central difference between the Kindle and the Nook used to be the color screen.
The central difference now is Amazon’s built in cloud service.
I own the old Kindle and have played around with the Nook color. The Nook felt instantly richer because of its touch display and color appeal. Amazon had no choice in updating to meet the standard.
But even before the Kindle Fire was announced, I felt more comfortable with an Amazon eReader mostly because of the content available.
You can’t get any of the Domino Project books on the Nook. I’m also more likely to receive an Amazon gift card for holiday.
Amazon beats out the Nook in the eReader market mostly because of its brand equity in the online space. People think of Barnes and Noble as a store, and I don’t know anyone who goes in there other then to relax in the cafe. Amazon has the edge.
We should all be glad that there’s more than one eReader. Competition means we consumers always get the coolest features and lower prices.