Depends on what you are trying to achieve- FWD will be faster round a circuit than 4WD as long as the car can deliver it's power to the tarmac.
Ford stated that the combination of diff and revo-knuckle suspension meant that 4WD was simply extra weight that they did not want to carry.
Haldex is just an electronicly controlled/actuated clutch that feeds a certain amount of power to the rear (or front if you are Lambo) wheels when required.
Depends on what you are trying to achieve- FWD will be faster round a circuit than 4WD as long as the car can deliver it's power to the tarmac.
Ford stated that the combination of diff and revo-knuckle suspension meant that 4WD was simply extra weight that they did not want to carry.
Haldex is just an electronicly controlled/actuated clutch that feeds a certain amount of power to the rear (or front if you are Lambo) wheels when required.