An independent testing firm has declared AT&T the “nation’s best network.” But it’s only the latest in a series of studies where the major wireless carriers battle it out for the top spot.

On Wednesday, Virginia-based Global Wireless Solutions declared AT&T the best network for the second year in a row. The firm conducted tests in all 50 states as well as Puerto Rico and the US Virgin Islands. They used a Samsung Galaxy and special benchmarking equipment, and also incorporated the results of user surveys. AT&T took top overall performance, with Verizon in second place, boasting the fastest upload speeds.

However, other independent firms have come to different conclusions when testing the major wireless carriers. In July, RootMetrics declared Verizon has having the best network (for the twelfth year in a row). That same month, OpenSignal rated Verizon and T-Mobile as the top networks. In June, PCMag.com said that AT&T has the “fastest mobile network” in its drive tests.

While carriers may boast about their national rankings, experts advise that consumers look at wireless performance within their actual geographic location, and measure it against their own budgets in order to find what works best for them.