torsens work best in the front, then center. It really depends on what type of surface you are running on.
If it it really bumpy and inconsistent, torsens will make the car handle worse
if it is really smooth and stays like that, then they will be of a certain benefit. You just really have to make sure the 100+ you are gong to spend on one of them is really worth it when you could put that towards a better motor, more tires, or a back up servo, etc