I was thinking of asking a question similar to this yesterday. I haven't eaten at Moe's (been there with someone but didn't eat) and have never been to Qdoba but I love Chipotle!
i've heard good stuff about Chipotle, but i haven't had it myself.
my daughter in law is mexican. and she lives with me. so we eat lots of good home cooked mexican all the time!!!!
I've never heard of the other two, so Chipotle wins by default for me. I do really like their food, though.
My favorite burrito place is Hot Harry's Burritos. I think they're mostly in MA/NY, but we just had one randomly open up here in Iowa about a year ago. Anyway, their adobo chicken burrito is super yummy.
I live in Canada, so my quick-service Mexican food options are much different than most of yours.
We have the most fantastic place called Mucho Burrito. It's delicious and so fresh. If you ever come across one in your travels, I highly recommend it.
I LOVE Chipotle - we go there every Thursday for lunch during work! I also like Green Cactus but not as much as Chipotle. The Burritos at Chipotle are so big I have half for lunch and half for dinner!!!
But for some out of this world Mexican food, if you're ever in the Detroit area, you have to try Mexican Town Restaurant. http://www.mexicantownrestaurant.com/
It is so good and right on that same strip is a little Mexican bakery that has the most amazing pastries.
I wouldn't wander off of that street and I prefer to go in daylight hours (luckily my DD16 is in Spanish Club and there is a field trip there once a year that always needs chaperones ), but it is so worth the trip.