Welcome to the forums, Edrab!
I like to think of this comparison: do you mind bloatware? Do you intend to root and modify? Does Gingerbread satisfy you, or do you want Ice Cream Sandwich out of the box?
Motorola phones are notorious for allowing Verizon to bloat them up with software that many people won't use and can't uninstall: like Citrix, Netflix, Blockbuster, NFL Mobile, MotoCast... just to name a few. Not to say that the Maxx has all those, but the point is made. RAZR MAXX also has VZ Navigator, a paid version of Google's free Maps Navigation app (which comes with Nexus). Motorola has also been very slow in unlocking the bootloaders on cell phones, allowing users to root and uninstall the bloatware.
PERSONAL OPINION COMING UP:
Finally: What will you DO with your phone? If you watch a lot of video, look at the screens side by side and see which is more vibrant. If you take a lot of pictures, check for shutter lag. If you make a lot of phone calls in a spotty coverage area, then check signal strength. Yes, Nexus has some radio and connectivity issues, which I hope will be resolved soon. But I have never dropped a call.
But there is more - a lot more - to picking out a phone other than when the next updates are coming out. Figure out what you want your phone to do the most, and pick the phone that's best at doing that.