My knowledge is restricted to aircraft with constant speed propellers, but as far as I know it's the other way around. Engine RPMs take far longer to respond than manifold pressure - try flying the Spitfire IX, set to manual pitch (Shift+0). Set prop pitch to 0%, then to 100%, and watch how long it takes for engine RPM to change. Then change the throttle setting, and watch the boost gauge. It should move almost instantaneously. When you say it takes longer for the engine to 'spool up', you're right, because the engine revolutions do take longer to change, but given for that the majority of the aircraft in the game, prop pitch controls the governed RPM, not the actual propellor pitch, this means that it takes longer for 'Prop Pitch' to change the engine's functioning than 'Throttle'. So for landing, better to have Prop Pitch set to 100% and vary the throttle since you'll already be operating at max revs if you need to go around.
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