To me, unless you want a huge battery(which is definitely nice), go with the Rezound or Nexus. But I'm a bit biasex because there are a few reasons why I don't want and don't like the RAZR.
The reason I don't want it is mainly because I came from the Droid 3 so the only real upgrade for me would have been 4g considering the OS is almost exactly the same between the two.
The reason I don't like it are the phone is just too wide for me. This is a personal opinion but it just feels horrible to hold. The MAXX is a little better due to the extra bulk, but it's still just too bad for me. It just feels too big and awkward overall. The other reason is Moto releasing the time frame ICS coming out.. you may be getting ICS when other phones have had Android 5.0 for a good while already. Even if the Nexus doesn't get that pushed right away, devs will be able to port it onto the Nexus fairly easily with no problems and without having to find many work arounds.
Also no removable battery. When I bought my Nexus, even a Verizon rep helping another customer looking at the RAZR said, "well what happens if by chance your battery does go bad?".
The MAXX is built better though hardware wise. I have no problems with the Nexus hardware, but its not as good.. but not bad.
Dev support is just better. A lot of the roms out now are mainly built off stock so there isn't a whole lot difference between a lot of them yet unless you use AOKP(which I'm on and is amazing) which has a lot of customization options to it. And then we have A LOT of themes. So having roms that don't stand out much yet is non issue. And just wait till we get a real version of Cm9 and MIUI due to our phone being unlocked.
. The RAZR gonna have dev support, but nothing like the Nexus.
The only problem I have with the nexus is the phone is a bit slippery.. and while I've never ran out of memory before(I still have a little over 15gigs left), the no sdcard is a little freaky. Its always an nice option to have.. but I should be good.
Sent from my Galaxy Nexus using DroidForums