With more and more devices coming to market supporting 4G LTE (long term evolution) networks, people are paying more attention to carriers' LTE coverage. And here in the States, no body comes close to Verizon.
With more than a year head start over the other providers, Verizon is the leader in LTE coverage by a mile. It currently has the 4G tech in more than 400 markets, and it sounds like it'll be everywhere by next summer...