My bet is on the Patagonia / Aeonclad's technology to MOST improve down's moisture handling characteristics. Ageonclad uses Plasma Enhanced Chemical Vapor Depositions (PECVD) which provides for a solvent less, pin-hole free, single-step encapsulation process in which the encapsulating or coating material may be modified depending on the process, itself.
In contrast, the other vendors apply a down DWR by misting the down with a hydrophobic polymer. This approach works great for demos of down floating in beakers of water, but the down will theoretically not have the lowest possible moisture regain value because their coatings are not pin-hole free.
I originally discussed this topic in the “Testing Waterproof Down” thread and James Marco's comments added to the discussion of testing with water in the vapor state as opposed to the liquid state: