I'm curious to see how reliable the Verizon network really is once the majority of their customer base is using data hungry phones like the iPhone or the Nexus. I'm not a big AT&T fan, but I do understand that their network is suffering due in part to the majority of their customer base using the iPhone. The iPhone consumes more data than any other phone on the market, and no other network carries the burden having that phone has their biggest seller.
Verizon is an AWESOME service right now BECAUSE it doesn't have iPhone. I'm willing to bet that once the playing field is even, and a ton of people jump off the AT&T network and move to Verizon, you're going to see vast improvements on AT&T's end.
Before I make any switches, I'm gonna wait for the masses to jump ship first. I want to see if the Verizon network gets bogged down in a similar fashion. I'd love to see everyone migrate to Verizon because of how bad AT&T has been lately, and in turn free up the AT&T network completely. Everyone to Verizon!