It's not a question of it being better, rather it's more of a question of which one is more appropriate to use.
For racing on a large high tack, good traction blue groove track with big turns then the TorSen may be better. For bashing and smaller looser technical tracks the regular differential may be better. Both affect the handling and stability of the car, the question you need to ask is "What handling problem do I have and what can I do to remedy it."
Using a different type differential is only another tuning aid to solve a handling problem in the car.