After two days of timing and comparing the
EDGE averaged a download time of 15.69 minutes for a 9.4MB file, while Wi-Fi required a mere 1.18 minutes. In the end, our test results indicate that the iPhone's Wi-Fi connection is about 13 times faster than using EDGE.
Tests were run at different points throughout the day to account for changes in network bandwidth, and the iPhone was reformatted after each download to ensure that Safari's browser cache wouldn't skew results. Still, there are a lot of network-dependent variables for both EDGE and Wi-Fi that can affect download speed. We did our best to be thorough, but your results may vary.
Anyone had a surprisingly good experience using EDGE?