Compared to the Dodge Magnum police car:
The Magnum will catch most cars, the Gallardo will catch all but a scant few cars.
The Magnum can f' up most cars in a pit maneuver and various bumps, the Gallardo will have to follow until someone runs out of gas.
The Magnum will attract little attention to the police force, the Gallardo makes people want to be a cop so they can drive it. (even though they're more likely to be positioned in Fiats or on the side of the road)