2 way is the best differential for general use
spool is best for 100% dry grip, 2 way is better for rain though, irrelevant for street/drift cars though
hlsd and vlsd are crappy compromises for "sporty" street cars
helical diffs dont engage. there is no clutch in a helical.
a hlsd will break before a clutch diff.
hlsd is stupid because it randomly biases torque depending on load so its totally unpredictable, plus you will still get stuck if you pick up a wheel on a driveway, since it will still bias all the torque to the wheel in the air, like an open.
i probably missed some stuff, maybe somebody else can jump in here and clean it up
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