They are both about the same... I like the square tubes on the Tule myself for my Bike racks, but for boards the round ones of the Yakama would work maybe better?
**** .. I've hardly been surfing since I left the Bay area... used to surf Half Moon Bay, and Santa Cruiz now and then... and Mission Beach in San Diego... now only in my dreams...
Anyway, you can get the basic mounts for the drip rails, and the cross bars you can cut to the needed length... good luck, and watch ebay once you find the right model for the mounts!