Who has better coverage Verizon or at&t?

I'm in Chandler Arizona

I'm leaving T-Mobile behind and upgrading to the iPhone 5s, i was wondering which would have me covered better?
I've already looked at the maps
What about Sprint? Should i keep T-Mobile?

Coverage is not really the problem, as you live in or near a large city.

Check out their "unlimited" plans and what is included. HINT: Unlimited does not mean what you think it does for most companies.

Verizon

Verizon has fewer dropped calls and better coverage in rural areas. AT&T is generally faster though. If T-Mobile was bad for you, Sprint will be the same as them.

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