I've always been curious to see why people dislike AT&T and would prefer Verizon. I've switched from Cingular to Sprint to T-Mobile to Verizon and now back to A

I've always been curious to see why people dislike AT&T and would prefer Verizon. I've switched from Cingular to Sprint to T-Mobile to Verizon and now back to AT&T and by far my worst experience has been with Verizon. A big part of the problem was likely with the handset I had, but the Verizon customer service department was by far the most frustrating of the group that I had to deal with. I cancelled my contract with them after only 3 months after spending over 20 hours on the phone with idiot after idiot during the last month. I got so fed up with them that I walked into the nearest AT&T store, bought a new Blackberry and threw away my Verizon phone (the other lesson I learned from this incident was to never, ever use a Windows operating system on my phone). In my experience T-Mobile had the best customer service, but they had a weak signal out in the suburbs of Chicago (in the city though T-Mobile had the best coverage by far, working deep underground in parking garages and elevators where pretty much nobody but me would have signal). AT&T has also been great, although come to think of it I don't think I've ever had to call them in the last 2.5 years so I'm not sure if their customer service is still alright. I would really like to know some of the reasons people prefer Verizon over AT&T.