Returned my SGN today, picked up a Rezound. I tried and tried to make up excuses to keep my GNEX. The phone design was beatufiul I really like it and some of new options from ICS are really useful. I love HTC, never had one by them but always though the UI was "cool", some say it's too much I think it's eye catching. I thought ICS was really well put together, just too plain for me, I left wanting more, not satisfied. The GNEX had a few hardware problems that shouldn't require you to d/l a 3rd party application to fix, haven't found to many problems with my Rezound, only have had it for a few hours though. My buttons do look "pink" instead of red, don't know if thats with everyone or not? No dropped calls yet on the Rezound, but not enough calls yet. The sound on the Rezound is a huge difference.
I've also been complaining about the GNEX being slow. I've took speed tests every day on the phone for a week, different locations, etc. I can tell you that the Rezound gets better LTE speeds for me, but barely! I'm talking 1-3mbps more. I still get two 4G bars, just as I had on my GNEX. So I don't see a big difference in the 4G department. Once I root and remove all the bloat I'll compare phone speeds. I wish the GNEX has the Rezounds hardware and I'd be set. I don't see you really going wrong with either phone. I think they are the best 2 phones on VZW right now, no one is really ahead of the other. When I got my GNEX after 2 days with it I got bored, I just feel that Rezound has more options, it's more of an entertainment/personal device to me hence the GNEX seemed more of a phone put out for the hacker/development user.