It does depend on where you live and where you travel to. You'd think in this large metropolis that both carriers would be equal. But, Verizon is far superior here. Of all the people I've personally polled, and they were many when I was choosing carriers, and my own experience having had both, this area is Verizon country.
AT&T is second. T-Mobile is a distant third.
Is Sprint even in business anymore? I don't even see commercials for them anymore.

They really did themselves in with the "All digital" network a while back. When people couldn't get a digital signal, bouncing off the buildings, their all digital signal wouldn't convert to analog to keep the calls going. Way to many dropped calls.
OP, if you want to switch carriers and port your number, it may be too late already. It takes a couple days to port a number. Doesn't the number have to be
active in order to port it?