If it's a consideration for a group/corporate environment, stick with the 8700. All WM 5.0 versions, including Smartphone version, are buggy as hell. We went the WM route a couple of years ago and deeply regretted it. If it's a simple, personal/professional purchase, just be prepared to spend plenty of time getting your hands dirty to keep it functioning smoothly. Frankly, we won't touch another WM device series until it's stable as a rock, which seems a long ways away at this point.
One shouldn't be required to have a mastery of mechanics to simply drive.