Despite what people trying to sell you Wavetracs will say, they are very easy to kill especially when autocrossing and depending on car setup, probably road racing as well.
If you have a lot of adjustability in the rear suspension, and it sounds like you do, then you'd probably be happiest with a clutch type or Torsen style. If you need to run a rear sway bar, then I'd go clutch style, and if you can skip the way bar and get all of your roll stiffness from the rear springs and roll center height, then I'd get a Torsen style diff like true trac. The latter style sort of just feels like it does its own thing, because it torque biases, and doesn't require tuning of its own, so you set the suspension up around it. On the other hand, if you get an clutch style diff from OS Giken, they will set the diff up around the car.
Matt
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1969 Camaro - always broken GM Design winner
1965 Mustang - widebody fastback
2006 Coyote swapped "Rental Car"
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