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You have to remember that a Torsen differential can come with different bias curves; that is, they can be designed to transfer more or less torque to the wheel with more grip. The bias ratio is still limited by the mechanical characteristics of the differential--a torque vectoring differential can transfer torque based on a control algorithm. It's a bit like the difference between a carb and fuel injection.
Another thing to keep in mind is that the BRZ/FRS will have stability control. This interacts with the differential. It just depends how the control algorithm is designed... there are many different control concepts and response times that can affect the performance of the system. It gets even more complicated when you are in real world road conditions with varying levels of friction acting on each wheel due to road imperfections, inclement weather, etc. Stability control can help a conventional differential (non electronic) work better by keeping wheel spin down.
Stability control + torque vectoring differential, like you'd find on an R35 GT-R etc, has the most flexibility and is not constrained by so many mechanical limitations. But it's also more expensive, heavier, more complex, etc.
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