Im pretty sure PX 12 jibs and SAS 120s are the exact same thing just different color combos. Rossi owns dynastar which owns look, so pretty much there all rossi bindings. IMO the axials look like they are more geared to the all mountain skier while the SAS series is more of a park binding series. I own the 120s and i havent gotten to ski them yet, but they feel like a solid good binding.
The axial 120s and the SAS2 120 are the same bindings, they just have different cosmetics. The SAS2 120 are considered the freestyle bindings, and the axials are just like regular binding. I have the SAS2 120s on my invaders and they're sick man, check out http://www.rei.com/product/774542 they have them for like $105.
hope this helped