This should be a no-brainer. After all, both of these German turbo all-paw rockets have highly efficient launch control systems, so surely picking a winner is as easy as reading the spec sheet?
In which case the laurel will go to the new Mercedes-AMG A45, its updated 280kW/475Nm 2.0-litre turbo four rocketing it to 100km/h in just 4.2sec, a tenth up on Audi's new 270kW/465Nm 2.5-litre turbo five-pot RS3.
As it turns out, it's not quite that simple, as one of these cars is capable of beating its claim by a big margin. But which one? Watch and find out.