Ok, I didn’t watch the video so I’m not sure how poorly Blackberry’s browser performed, but according to Pocketnow WP7 was the “clear winner”. WP7 was “was much faster and responsive when zooming, panning, and re-rendering content while the BlackBerry appeared almost unusable”. For the record, the Blackberry was using 3G while the WP7 device got to hitch a ride on some wifi. However, load speeds don’t really have much bearing on Pocketnow’s criticisms, so take that how you will.
Video added below.