Switching iPhone 4s from ATT to Verizon in Santa Fe, NM

Hi All,

From the subject line: I am currently living in Washington DC and ATT service is reasonably good. In Santa Fe, NM where I am moving, ATT has awful service and Verizon has a much better reputation. I am considering switching upon my move. What are the significant differences between ATT and Verizon on the iPhone? I understand that data network access and phone calls cannot happen simultaneously. Not a situation I usually encounter. Are there any other significant differences that I should know about?

Thanks.....