AT&T might be faster, but it's not faster if you can't even connect!
So how many people will ask for a handout from Apple when they release a 4g LTE iPhone 4g this summer and want to get compensation for buying the older model only 4-5 months before the new one comes out?
How likely is it that the next iPhone will feature 4g LTE? And how likely is it that Verizon would get it right away?
If it doesn't feature 4g technology then I am less likely to switch to Verizon as the speed and simultaneous voice is somewhat important to me. Unless the upgrade is significant in other ways then I might not upgrade my iPhone for the first year ever. This will save money on the termination fee the following year as well. Although when I go home to KC the service on AT&T is terrible with many dropped calls and data dead zones, especially on the Kansas side.
If I had to guess, I would say VZW gets a new LTE phone next February and this summer ATT gets a new iPhone 4S...