I've been on Verizon, on and off, since 1998. My family has been on Verizon (and its predecessors) since around 1987. We've never been screwed by Verizon. I have also had a phone or broadband device on AT&T since 2008, if I recall.
My brother was screwed by Sprint when he received a new phone under warranty, and they tried to collect an ETF when he left a month later. (His contract had been over for months.)
I was less than happy with T-Mobile when they collected an ETF, despite the fact that I could not receive cellular service at my new house. I wouldn't called it being "screwed", however, since I was the one that moved, not them.
I was less than happy with Sprint when they changed the terns of service on my tablet and refused to let me out of my contract. The fact that they have a 4G hotspot in their retail stores, and the service is virtually useless "in the wild" borders on fraud, but I wasn't going to take them to court for $200.
In fact, Verizon has consistently given me the best customer service for my personal and business mobile phones. When I had a problem with my 3G modem a couple years ago, a tech actually drove out to my location to analyze the signal. Then he had the nearby cell tower adjust their power settings to fix a conflict between two nearby towers (they were fighting for my modem's attention.)
You can't beat that kind of service.
Aside from Verizon, AT&T has been very close in terms of reliability and performance, and I am very happy with the performance of my iPad on AT&T's LTE. When my contract with Verizon ends next year, I'll probably switch to AT&T so I can use the unlocked Nexus phones going forward.