That's all they got? Kind of ironic when you think about it. There claims of superior network due to being able to talk and surf the web at the same time is the reason why GSM voice coverage is inferior to VZW voice coverage. CDMA seperates the two functions and can handle loads more calls per tower. Moreover CDMA is has the largest calling area in the US due to it being invented by Qualcomm an American based company. While the framework for CDMA all ready exsisted, GSM carriers, such as Tmobile or ATT had to build their GSM base stations from the ground up. In fact, Sprint and VZW will be rolling out "4G" soon, and VZW LTE system will be able to support 1080 HD streams among other high band with apps. GSM infrastructures are approx 1 1/2 behind at minimum.
However, worldwide GSM is the standard; therefore, better for people who travel often. The primary reason, from what I have been told, from years of working in the telecom industry is that international carriers went with GSM to avoid paying royalties to Qualcomm for using their technology. CDMA is the more efficient of both technologies as it can handle > than 70 calls per channel per tower opposed to around 45 for GSM. Moreover, in the states CDMA has the largest coverage area and more advanced data network and is the best choice. For those who rely on non biased opinions Consumer Reports has rated VZW the number 1 carrier in the US for more than 3 yrs.
In short, although I do like the Iphone, my personal preference is the Android OS. I will not by another phone with a different type of OS, at least until something better comes out, which I doubt will happen. I trust google, and they have the resources to grow this OS like no other company can. ATT can suck it.