Coverage maps are one thing, actual coverage within those areas is another.
In our travels through the South, Southeast, Southwest and mountain states we have found there is no better service than Verizon. We have lost track of the number of times where we are near people with other service, especially ATT, where they have NO service while we are talking away or using data. Many is the time we have loaned our phones to someone needing to make a call but their phone with another carrier has no service.