Who has the best service us cellular, Sprint or at&t?

I want a new phone company. I know Verizon is the best of all but they are to expensive and my contract has ended. I had Sprint for a month but I don't remember if I liked them. I was thinking of going prepaid with a monthly plan through a phone company but I'm not sure what to do. I commute a lot between my home and my finances home. And when I'm there I drop calls and have horrible signal. He has US cellular and it works perfect for him. But I kind of don't like us cellular being that they are the last to do anything like 4g, getting droids, iPhones etc. I tried using the coverage map for at&t, T-Mobile and a few others and when I type in his address It says no coverage. What is there to do

Probably at&t

AT&T