IMO the Inspire is the better phone. I know its been posted before but I just want to add to it. Even if the Inspire was priced the same as the Atrix I would choose the Inspire.
I can't stress how much that software is what makes a phone, not hardware. The software on the Atrix is pure balls. Motoblur is an abomination. You HAVE TO create a motoblur account as soon as you first boot up the phone when you get it, no way around it. Scrolling from screen to screen is choppy, the Sense like preview is choppy, live wallpapers are choppy. Even using Launcher Pro, ADW, Go Launcher, and Zeam are mysteriously choppy on the atrix. Don't even think about putting live wallpaper on any of those 3rd party launchers either, it's choppier than blur with a live wallpaper. I honestly believe Motorola made their software so bad that you almost have to use Blur because 3rd party launchers are choppy on it.
Then you have the camera app, the pinch to zoom in the gallery on my old Droid Eris puts the Atrix to shame, I can't believe this phone is a dual core phone, the pinch to zoom is so laggy and choppy I had to install a gallery app from the marketplace.
You wanna add contacts from gmail, it will also load up all the contacts you have under "Other Contacts" will show up as well. Basically anyone I sent an email to on my gmail account even if it was only once, came up under my contacts on my atrix.
Battery life, for a 1930mAH battery, it sucks. With almost 100% similar settings on my Inspire, I get better life on my Inspire. I can get a day on my Inspire, I can't on my Atrix. Even with my brightness at 0% on my Atrix I get worse life on it.
I'm not trying to troll the Atrix because we are on the inspire forum, I'm just providing another point of view on both phones because I'm sure some people are undecided between the two. The only thing the Atrix has going for it is the screen, its really bright at 0%. My Inspire does everything the Atrix does performance wise and better in a lot of areas Oh wait I forgot, you can delete some ATT bloat on the Atrix thats the only other benefit. Now sure you can root the Atrix and get rid of the blur crap, but not everyone roots.
I've never owned a phone so crippled by the software behind it like the Atrix. You look at the specs and this phone should give you an instant erection, but once you use it, you go softer than an 80yr dude that ran out of Viagra.