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Ugh, I hate this argument because there is so much misconception on the basic kinematics and relationship between power, force, and time that causes each "side" to like their own dyno.
My take on it - a steady state dyno is great for engine tuning to find small variations in engine VE and knock sensitivity, but it is *NOT* accurate for the conditions on which an engine will actually operate. An engine sweeping through an RPM range is not the same as one being held at a given condition at WOT/partial throttle/whatever.
An inertial dyno is arguably closer to real world conditions the engine will operate in as long as the dyno roller inertia times angular acceleration is relatively close to the combined aero load plus mass times linear acceleration of the vehicle would see in a real world 4th/5th gear pull.
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