Owned all three, here's how i feel:
Speed (lack of lag):
GNex>Razr>Rezound
(SenseUI destroys the rezound, way too laggy. GNex and Razr are comparable, GNex just a teeny tiny bit smoother)
Screen (IMHO):
GNex>Razr>Rezound
(Even though the Rezound supposedly has the best screen in the world for a phone, the LCD makes it suck, Colors are dull and washed out. GNex is known for having artifacts and poor vibrancy for LED. Lack of Gorilla glass on the GNEX and Rezound are turn offs but not deal breakers. Mainly, I gotta have LED.And i don't need 1080p on a 4 inch screen, my eyes aren't that good to notice the difference, or care)
Signal Strength:
Rezound>....Razr>......................................................GNex
(The GNex has such terrible reception issues, they shouldn't even be allowed to sell it, it should be recalled until it's fixed. Even the wifi antenna sucks. I was standing next to my router and only got 2 out of 4 bars. And never saw more than 2 bars of 4G.)
(The Razr has decent acceptable reception, what you would expect. Not great, but good)
(The Rezound has hands down theee best reception i have ever seen on any phone, ever. I NEVER went below 4 bars of 4G. And 99% of the time was at 5 bars. Even places where other phones dropped to 3G, i still had full 4G. On Rezound, my wifi picked up while i was coming down my street. GNex didn't even pick up from certain places in my house, and Razr picks up in my driveway)
In the end i went with the Razr Maxx, It was between the Rezound and Razr. (The GNex is a very expensive paper weight.) The combination of the LED screen, battery life of the Maxx, smoothness of UI compared to SenseUI, Gorilla Glass on the Razr, and acceptable 4G reception/signal strength, sold me on the Razr Maxx.
P.S. I believe that if they made the Rezound with an LED screen and without Sense, it would be hands down the best phone on the market "right now". Oh and maybe a slightly larger screen