ive always thought rockered skis have the best pop, ive never skiied something as poppy as the original ep pros. in the park and on hardpack, those things pop like crazy, same thing with bents, but not quite as much. as for flat, ive had 2 flat skis, both are on par with camber skis, but the flex is more predictable, and better for kinda buttering onto things, or like butter then ollie, where camber is just good for one pop.
rocker camber rocker, or dual camber, im not a fan of, i dont like how it makes the ski feel, makes it feel like a normal camber ski, but in a weird way, maybe its because when your flexing against the camber, its a much shorter camber section, and the rocker tip and tails dont do much other than make it less catchy on take offs. if your gonna go rocker, just keep it flat under foot, it skis sooo much better, more surfey, predictable, poppy, and can still edge just as well.