How does the internet speed of the iPhone compare to that of the blackberry curve?

How does the internet speed of the iphone compare to the Blackberry Curve? Since they are both on the ATT/Cingular Edge network, they should both have virtually the same internet speed. Up to 200 kbps max.

However, if you then switch from the phone carrier network to wifi, The iphone connects at broadband speeds, where the Blackberry will not. It does not do wi-fi