[chrisguyw]

Largely depends on the track surface !!.................if the tracks have anything added to the surface to replicate snowy/muddy/loose conditions, there is an argument for 4WD.

If the tracks are "clean" and consistent, I would favour rear wheel drive every time

Cheers
Chris Walker

PS if employing 4WD, different tyre compounds, different ratios, and different tyre diameters (all of these front to rear) are commonly utilized.