In this paper. we provide a welfare ranking for the equilibria of the supply function and quantity competitions in a differentiated product duopoly with demand uncertainty. We prove that the expected consumer surplus is always higher under the supply function competition. irrespective of whether the (duopolistic) products are substitutes. https://www.ealisboa.com/mega-grab-Yocan-CubeX-Replacement-Coil-5pk-must-buy/