Personally I prefer hybrid rocker camber on all decks, including for pow. At the same time, as previously mentioned, there are plenty of other factors that go into determining how well a board will float such as setback, taper, sidecut, nose/tail shapes, placement of rocker/camber zones, base material, and on and on...
16 NS West . 15 NS Snowtrooper BIA . 13 Salomon Pow Snake
15 Now Drive . 14 Burton Genesis
14 Flow Hylite