Moto Q has had a few glitches. But Telus is fixing up a firmware update as we speak. What it boils down to is the need. What side of the phone do you need to most? Moto has better phone (voice signal dialing, better RF I have found, MUCH smaller, and real buttons for dialing). UT has Wifi and PPC with touch screen and larger qwerty keyboard. You can get advanced voice dialing through a third party app and can not be triggered from a BT headset, push and holding the start button.
Personally I love the Q. I don't have Wifi, and have so much cool things going that I wouldn't trade it for the world at this point. It does freeze occasionally, but minor inconvenience. Usually happens with unsigned thrid party apps glitch. a quick poer cycle and good to go. Great MP3 player with stereo speakers, BT stereo headphones, or using conventional wired. Screen is amazing. I have a Divx player running and it's clear and smooth video. Boils down to great at multimedia.
6700 is better with productivity. Pocket office for one, something the Q does not have and no apps yet exist to get it. You can view on the Q, but not edit.
So chose on your priorities. My advice.
Oh on the repair thing, yah have had a few. All software related. Hardware is good.