Wrong.
Verizon beats AT&T hands down.
I have Verizon personal phone & AT&T work phone. I never drop calls with my LG Dare. I always drop calls with my Blackberry (only 2 weeks old - POS). I was with a friend of mine yesterday & he was dropping calls with his iPhone on Arona Rd yesterday. I can talk from one end or Arona to the other without even poor sound quality.
My company also switched to AT&T aircard & it sucks even more. It runs so much slower & drops several times throughout the day. I’ve had Verizon Phone & card for the last 3 years. The card only dropped maybe 3 times per week (I am connected 9-10 hrs per day, 5 days a week). The AT&T card has dropped 3-4 times a day.