Get your history right kids, if the discussion is between skis and snowboards, snowboards win. Back in 1984, remember that year? It was the Lamar Trickstick, and it was a rockered snowboard. Maybe earlier was the Checkered Pig too.
As for skis, Volant crated the Spatula, a rockered and reversed sidecut ski based on McConkey's ideas. When he came to K2, he helped us develop the Pontoon, a rockered ski with a regular sidecut.
Armada followed next with the ARG, and last year at SIA, we brought out the Hellbent, LINE had the EP pro and Salomon showed their 'Rocker' Ski...which is a funny name, because only the tip is raised. I assume you will see almost every manufacturer offer rockered skis.
Also last year, K2 Snowboards had their rockered Gyrator and Lib Tech had their Skate Bannana...which they refer to as skate technology...even though it was done on skis two years previous...hmmmm, nevermind.