Keep in mind fastest as in top speed is not the same as speed around a course. For example, at the right wind angle the Hobie 16 is fast or for another the Tornado's top speed is limited by lift on the stern driving the bow under.

For top speed look at the speed runs made in England. I don't know if anyone is currently running them.

For speed around a course, it mostly depends on the skill of the driver and how well a boat is developed.