In my review of the Verizon iPhone, I found that its call quality and reliability were superior to that of the AT&T iPhone’s. However, data transfers were significantly slower than AT&T’s, making the AT&T iPhone better for media consumption (watching Netflix, downloading apps, etc.) while the Verizon iPhone is superior for phone calls
http://www.wired.com/gadgetlab/2011/02/consumer-reports-verizon/
