I guess it is easy to forget about the HSPA+ support since my iPhone 4 doesn't have it. I think.
I figure it will probably be a year before LTE comes to my home on ATT, though Verizon has it.
I think that Verizon would be better if I do more traveling in rural areas. I know that Colorado was bad for ATT for me.
Exact same thing here in Fl - great Verizon LTE coverage now locally, and we travel mostly in rural areas with little to no AT&T coverage of any sort. I at least get EVDO with Verizon, which is useable.
I converted to VZ on my iPhone 4S purchase for the same reasons.
Right now I'm paying for a VZ hotspot because we had no internet service many places we travel to every year.
If I was staying in metro areas, AT&T would be a stronger option.