My dyno numbers

Jordo!

Accuracy is relative -- you'd really have to pull the motor out for a "true" value anyway.

What matters is consistency.

For an individual car, that means sticking with the same shop; across cars, that means the same values must be entered for the formulas used to estimate power and torque -- on dynojets, that value is fixed (known weight and diameter of drum) on load bearing dynos, that value may be quite different from shop to shop.

Load holding dynos are better for tuning, and perhaps for making comparisons for a single vehicle, but they make it much harder to evaluate the results for any one specific vehicle in relation to data gathered from other vehicles at different shops.

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Enjoy it. Destroy it.