Funny I am neutral to this whole argument because:
VZ Customer Service treated me like dirt after 8 years of being with them, all because of a 2 day old smartphone running Android that was flawed, so all I wanted was a refund with no restocking, no dice. I always wanted an iPhone but hey Verizon was useful but then that day came where they treated me like dirt, worked with several managers to no avail. Went to Best Buy and bought a 3G, used it for some time, no issues with data or voice, then 3GS came out same thing, great service great data. Then we noticed with Verizon if you do not constantly update your roaming every month, or if your using an older device your service gets worse. My wife was using a Doid Eris right after they came out, and I was using 3GS. Where ever we went, I had the same amount of bars, and my data seemed faster (never mind it was not an issue about data and voice at the same time). We started to notice the signal with the Eris was getting weaker, and service spotty, went to VZ to get replaced under insurance, but went thru 3-4 and same issue, so store manager says hey buy a new phone and you wont have that problem, my wife and I were like really this Droid Eris was 6 months old and you are telling me if I want good service to buy a new phone at full retail?????
Called customer service back then went to the store after hours of arguments, they sent a replacement again, but sitting in my house no service and we always had service. I had enough, called AT&T went there and tried to move both sons and wife to AT&T with iPhones, then more fun with Verizon trying to port the numbers over, so frustrating dealing with them, decided to just get new numbers on two and ported one with all sorts of issues for 2-3 days. Paid ETF on one VZ phone didn't care as I was treated like a dog, so now 4 of us on AT&T getting good service for Voice and Data, in fact AT&T felt bad and gave me a credit of $50 on my bill bc Verizon had to cry we were leaving and wanted to play rough porting one number over, and blamed AT&T.
Long story short CS for VZ stinks, and I have now been with AT&T 3+ years with 3G, 3GS, and iPhone 4's with no issues, good service etc. If VZ customer service was .10 percent of AT&T's I would never have left, so I am not blaming VZ or AT&T, however I was treated better and every time I call AT&T CS it is a good day, anytime I had to call VZ CS, I cringed and could never do what I had to do for less than 45 minutes on the phone.
Had Sprint and T-Mobile for Work, could not get a signal basically anywhere so I would never go to them.
AT&T is not as bad as ppl make them out to be, so you will always find someone has a preference based on their experience and how they are treated, it is not always about Data and Voice etc, but why can't VZ as strong as they are provide this to their customers? let us be real, then can, but they have it turned off on EVDO, and so far I have not heard if they will enable on LTE, but I doubt they will give you an extra service unless they can make money doing it, so to the point, I pay less for AT&T and get more than I do with Verizon.