Max flow is more consistent in the delivered pressure, the AIR has more cool features. Both will suck the last few shots out of the tank.
Do you prefer bells and whistles or no frills performance? These are 2 great systems, but the virtues of each are a little opposite.
By the way, there is a plastic seal on the AIR that will die one day. Not hard to replace, though.
By the way, the max flow is sorta ugly and chunky... until those new ones arrive.