Hello fpar5578 - This really depends on how much you are going to use it and where. Yes, Verizon is the best in coverage, but also the most expensive of the bunch. AT&T is also good (right behind Verizon(, but second most expensive. In my case, where the RV park's WiFi was poor, I used Straight Talk, which is a pay-as-you go (i.e. no contract). The Wifi puck was cheap - $49. It worked fine for me for what I needed it for (now and then). You may want to look into T-Mobile. Although the coverage is not as good as the leading guys - Verizon and AT&T, they have an aggressive/competitive price structure. I would talk and "not sign up" with the major carriers to see what fits best for you.
2010 Newmar Dutch Aire 4317, IS: 425HP, 2014 Chevy Captiva