I tried both and have decided to go with the Kindle. My wife and I both thought the glitchy lag between page turns on the Nook was a deal breaker. It was far less noticeable on the Kindle, and we haven't even gotten our new gen Kindles yet.
Also, the UI was slicker on the Kindle (in my opinion). You'd think a touch screen would be better, but it's slow, laggy, and glitchy compared to the Kindle interface.
Still, I liked both of them and the differences between them were very slight. It really came down to that page turn lag for us.
Still, I liked both of them and the differences between them were very slight. It really came down to that page turn lag for us.