Oh yea, my mistake. Of course its a Snowpulse. ABS is really imprinted in my brain as a synonym to air bag pack. I guess their marketing paid off ; D
I would have preferred the PAS system as well. But I am wondering if it would be harder to activate the system and then try to ride out of the avalanche with the PAS because of the air bag around you head.
I think that Mammut, who now owns snowpulse, is the only company allowed to use the PAS while the RAS is compatible with many different packs. This is the nice thing about the RAS, you can switch it between many different packs, and it travels on airlines much easier than other systems. This licensing allows many different pack options, different size options, ect. I could see having a smaller 30L for most days, and a 45L for bigger trips, and just switching the bag over.
The PAS system is sweet, but pretty bulky, especially as it is built into the straps of the pack as well. This adds weight and bulk. Not terrible, but it is noticeable. It's also more difficult to build into a pack for this reason.
Either way, both products are great, just have to decide which is best for you.