Sparky wrote the gospel according to Torsen, I am a disciple. Now with them, he has performed miracles, we turned a few minor tricks.... The big get with them is the r&p sets, you can get ratios down to 2.14 with the 10 bolts. As Tristan said the theory is very good.... if the resistance on one axle decreases torque is fed to the other. This would seem to be a far more intelligent way to manage than grabbing the other axle solid if a wheel slips...
We don't really have enough power to delve into the realm of constant wheel slip and we also have a pretty clean shape, but I'm here to say it's done us some good.
Having said that our third member/rear end has mixed heritage, torsen centre, Camaro style housing, Ford tubes and axles..........
On top of all that the 10 bolt has the highest pinion to crownwheel height= least mechanical losses. Win/win !