I was really on the fence when it came to Rezound vs Nexus... I finally went with the Nexus because of the size of the screen, which really does make a difference for a lot of activities (especially watching video), and the fact that it's a Nexus, which means it will be supported practically forever, plus any software problems it has will be ironed out by the massive dev community following it will have even if google doesn't do quite what I want with them.
The Rezound has better hardware in my opinion, but the Nexus will make up for it in the software and support department. I am not 100% sure I made the right decision. The Rezound's camera is astonishingly good, and the screen offers unquestionably superior image quality. However from playing with both they are pretty equivalent speed wise and it's hard to appreciate how much better the Rezound's screen is unless you hold it less than a foot from your face, which I have been known to do, but not often. In the end I have until January 15th to decide if I want to stick with the Nexus, and if I am not completely addicted when the time comes I can always swap it out for the Rezound, LG's upcoming offering, or whatever other shiny new toy comes along.