I honestly think these are for two distinct markets with some overlap.
The Action is, well, an action cam. You get it wet, you get it dirty, it is designed to be rattled around.
The Pocket is more for panos, stablized movement (can do with Action also) and motion timelapses.
The question is what do you plan to use it for. If it involves water or mud or possible bumps/drops, go with the Action. If not, go with the Pocket.