When I had to find a new wireless carrier after Qwest quit its wireless service, they "partnered" with Verizon, and offered "deals" to switch to them. I went online and to a physical Verizon store, and I was disappointed in phone selection, plans, and pricing. I went to ATT and found a much better deal for my family, got smart phones with NO Required data plans (they are now, but not back then...just 3 months ago), and no, we didnt get i-Phones, so I am not biasing choice here. Customer service with ATT was MUCH better than our experience with Verizon. *shrug*. Surveys, metrics, statistics can all say what you want them to say...just need to play with the numbers.
I guess the message is, go do your OWN comparison, like others here have said, and pick which works better for you; for me it was ATT.