I've been to every state in the contingent US, most many more times than once, and spent most of my time in rural areas / wilderness. Verizon was poor during the time I had it. I forgot what triggered switching from them but I didn't last long, had to switch to ATT. I switched to ATT because my Tesla uses them and I noticed it almost always had service in remote areas when I did not. Haven't needed to switch since.
ATT has a great plan for the Americas, south America is all covered, Canada is covered, and many other places. It worked really well for me in Brazil.
That said, when I start traveling to Europe and Asia more, I may switch back to Google Fi.
For domestic use, while traveling / on the road a lot? I would rate as follows:
ATT > Google Fi > T-Mobile > Verizon
Keep in mind, if you are mostly stationary it is better to use the carrier known for good service in your fixed location.
ATT has a great plan for the Americas, south America is all covered, Canada is covered, and many other places. It worked really well for me in Brazil.
That said, when I start traveling to Europe and Asia more, I may switch back to Google Fi.
For domestic use, while traveling / on the road a lot? I would rate as follows:
ATT > Google Fi > T-Mobile > Verizon
Keep in mind, if you are mostly stationary it is better to use the carrier known for good service in your fixed location.