Airmatic: Pump, lines, shocks, sensors, computer. It works or it doesn't for the most part. Easy to diagnose and repair.
ABC: Pump, lines, valve block, shocks, accumulators, sensors, computer. Has double or triple the amount of sensors, 4 accumulators, and two very expensive valve blocks which airmatic does not have. Way too many ways to go wrong and not as easy to diagnose.
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