My TC3 = nearly undriveable (on our low grip track) with a BL. My TC5 = bloomin lovely with a 10.5!
The difference is that the shaft drive immediately transfers (minus minor mechanical losses) the torque from the shaft of the motor to the wheels. So, either god-like thumbs or electronic wizardry need to be employed to tame some of that torque. If you push the stick just 2mm too far, the wheels will break traction and you'll lose time.
Whereas, a belt will tighten and stretch slightly, making for a more forgiving drive and the car will track straighter because there's no torque steer.
On the other hand, if I wanted to do some high speed runs, it would be shaft drive all the way as rolling losses tend to be lower.
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