Read an article a few years back comparing skiffs, windsurfers and kites. Specifically the Bridge-to-bridge.
The winner depends on the strength and angle of the wind.
High winds and a 120 degree angle the windsurfers win.
Light winds and you can't compete with the sail area of a skiff.
Kites can go dead downwind.
Something like that.
Quick google search returned:
www.windsurfingmag.com