I only know info about the Seth's and Hellbents. First off the hellbents.
Great Ski in any amount of pow and any type of pow. Mine are incredible with heavy or light snow and are always on top of it. The underfoot is huge on them as is the rocker. On groomers i have to fight to keep them going straight at high speeds so that would be my only gripe.
Next the Seth's
From what i've heard they are one of the best all mountain skis out there. I'm pretty sure they arent rockered but i might be wrong. The underfoot is just enough to keep you above the pow and from what i've heard they hold up really well on groomers.
Thats my two sense but i might be wrong about some of my points. Others feel free to correct me if i'm wrong