since i have used all three i think i can help.. You didn't even mention taking pictures with your phone.. so I will take my personal preference for that out of the equation.
at my house i get pretty good signal and this is looking at the RSSI not the signal bars.. My rezound was on par with my razr and pretty much all other phones I have used. the Nexus has noticeably lower signal reception at my house.. I don't notice any difference in call quality because although it is lower I live in a pretty well covered area.. but being worse here I am sure would translate to dropping calls/not being able to make calls elsewhere. The earpiece speaker volume on the nexus is the lowest of the three.. I have found myself saying what more or covering my other ear to block out ambient noise..
If you will focus heavy on the "phone" part of the smartphone I would get the Rezound it feels super solid, and the added beats audio equalizer is pretty decent (i don't care for the Beats headphones, but the EQ is nice) I was just in the mountains last week with my rezound and I wish i could have had all 3 there to compare b/c the signal where I go is horrid.. but it has been that way for 5 years no matter what phone i have taken.. Suprisingly my wife's iPhone was way better than any phone i have ever seen up there ..
If your really concerned about radio strength honestly I would stay away from the Nexus at this point.. The day I got my nexus I went to my kids christmas play at my church and the nexus was signal was bouncing from 4g/3g alot, and my rezound never had that problem... I always like something new so I will deal with the nexus issues for now, but if I knew i was gonna be using it for two years, I would seriously consider returning it.