Which wireless network is the best in the US? Well, that depends on which report you believe.  

RootMetrics, which released its latest rankings on Thursday, has once again crowned Verizon the overall winner. But last week, Ookla, which offers a speed test app users can use to test network speeds, said T-Mobile had the fastest network.

JD Powers also came out with its own rankings last week, putting Verizon top of the heap. These reports come at a time of intense competition in the wireless industry. Over the past couple of years, the four major wireless carriers have fallen over each other offering promotions to steal each other's customers. But price is only one factor in winning over customers.

Customers also care about speed, reliability and overall user experience. And the marketing departments at each of these carriers are eager to use results from independent firms' reports to make their case to consumers.