It gets better.
Michael brings up the extended 900mhz wcdma network, however fails to bring up the fact that the iphone 3G/3GS (the iphone was explicitly discussed in a previous post) cannot use it.
So when it comes to 3G coverage for the iphone - XT wins.
Nor does he mention that most people are where they still do not have extended 900Mhz 3g, just 2100 and crap GPRS.
If you own an iphone you should be on XT, end of story. It is unusable on vodafone with the drop back to GPRS that happens as soon as you start to do anything on it.