I don't know about where you live, but where I live (a more rural area about an hour from DC), Verizon is king, as it is in most rural areas I know of. Verizon has, hands-down, the best cellular coverage in rural areas. Of course, they also have the very worst service, and the most astronomical prices. But people in rural areas happily pay it because they're unwilling to put up with less-than-stellar coverage from the other telcos.
Personally, I have a Sprint phone with Ting and it works well enough. I'm not willing to pay $150/month more just for better coverage. Sprint's service is "good enough", and doesn't cause me any problems.