It would be great if someone could come up with a summary of the offerings by the big 3 carriers; and the quality of service on the network. I'd love to switch

It would be great if someone could come up with a summary of the offerings by the big 3 carriers; and the quality of service on the network. I'd love to switch to Sprint, but I'm not sure how their cellular network stacks up to ATT/Verizon when in remote areas. I'm on ATT currently, and was surprised to get reception at the top of HalfDome (though I have trouble getting it in my neighborhood in SF :-/ ).