[CSG Mike]

Originally Posted by CSG Mike

In a purely theoretical context, draw a force vector diagram, of the rear wheels pushing the car forward for acceleration, and the front wheels exerting a tangential force for cornering. Now, tilt the drawing to simulate "oversteer" by tilting it in the force of the tangential force from the front wheels. Notice how the lateral tangential force is additive with the components of the rear force vector. Now, tilt it the other way to simulate understeer, and note how the vectors are now subtractive.

Oversteer is always faster, in a theoretical context. In a real world context, you have to be able to manage it, and most drivers will be faster with an understeery car, because they fear oversteer, and avoid it, instead of seeking to exploit it.

Quoting myself for visibility.