Add Force or Motor Torque .. Which is better for creating a car?

Hi guys, I was looking into the unity car tutorial available in the unity asset store. In the tutorial force was applied to the rigid body of car to make it move and also to simulate drag. There is also a tutorial in youtube in which motor torque is applied to wheel collider to make the car move. So my question is which is a better approach to make a car? Assest Store Tutorial : http://u3d.as/content/unity-technologies/car-tutorial/1qU Youtube Tutorial : www.youtube.com/watch?v=c5Snsi68xzE Thanx in advance!