If the clutch engages/disengages several times per lap (an oval with short straights or a road course), then the disc clutch is well worth the money. Discs have a uniform temperature distribution and consequently have a uniform engagement rpm. The shoes in a rim clutch develop hot spots that cause the clutch to have a different engagement rpm every corner, every lap.

But, if the track is wide open and the clutch is used only at the start, then almost any clutch will do.