peak horsepower? low or high?

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A peak horsepower at low rpm or peak horsepower at high rpm. ie 252hp * 4800 rpm, 250 hp * 6000 rpm. Which one will deliver authoritative power? Vehicle displacement is a not a question here for all other factors being equal, a larger engine displacement is therefore more powerful than a smaller one. The grey area is the peak horsepower

What do you mean by authoritative power? What type of scenerio are you requiring the power?

Peak horsepower isn't as important as the horsepower curve of the engine. Because peak horsepower is just that, the peak of the horsepower and power will start to drop off beyond that optimum rpm of the engine. The best would be an engine with good low rpm torque and mid to high rpm horsepower curve.