I don't have experience with these two systems, but I just installed a Air Force one on my Jeep/ Phaeton. I picked the AF1 because of the air connection, and no inertia sensing. So I would recommend using the air activated system. The AF1 also generates a vacuum for the toad, so there is no battery drain.
During testing, I placed a pressure gauge on the air connector from the coach. And I got a truly proportional pressure based on the brake pedal pressure in the coach.
You have the ability to make an adjustment by moving the mounting point of the air cylinder up/down on the brake pedal arm (adjusts leverage).
For these reasons, you might prefer the air actuated system.
Dan
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2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2019 Jeep Grand Cherokee Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -Cave Creek, AZ.
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