Don't consider the clutch type locking action to be absolute, the amount of lock can be adjusted by varying the amount of slip additive. The hardcore folk actually rebuild the differentials with extra clutches for a stronger locking action, not necessary for us mere mortals. The clutch type differentials are better suited for track use, they don't generate as much heat as a torsen style differential, they last longer, are more predictable (if you lift a wheel or spin both wheels) and can be more easily rebuilt. The downside is that you have to do diff oil changes frequently.
The torsen style are very smooth for the street, and gives much more torque transfer than a viscous unit.
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