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if you want to compare different cars on a set of rollers the only true way to get the power figure is to meassure the run down losses to arrive at a flywheel figure, as this will take out differences caused by tyre pressures and compounds different gearing etc, on the rollers my race car has more power at the wheels on slicks than on my wets but the engine is still making the same amount of power.
but if you are only tuning the same car it doesn't matter which you use as long as you keep everything the same we once saw a 10 brake difference on my car by blowing up the tyres!
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