Like I said, both at&t and Verizon are fine, but Verizon is a tad bit better. I use both and at my job, Verizon wins hands down. I don't know what the problem is, but at the entrance of my job, placing or receiving calls are hit or miss while Verizon works every time. Even throughout the building, Verizon's signal is more consistent than at&t's.
Keep in mind that this is my experience and that your experience will vary depending on location. I've been with at&t for 10 years now, so I think my opinion is fair. The only reason I have Verizon is because they use it at my job. Both services work fine in NYC.
All I am saying is that the OP should test the service first before moving multiple lines over. I'm not saying not to go with at&t.
. Three, in my opinion they have a better selection of phones and they don't restrict the crap out of them like Verizon does. If AT&T's service area was expanded like Verizon's is(I can go camping and still get service) I would say AT&T is better, but for now, I may like AT&T but I still say Verizon is better tell AT&T gets their 3G service expanded and fix all of the dropped calls.