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Quaife (is the spelling) is what most people go for, unless you are made of money - then get the Gripper diff.
Quaife is fit and forget, so it has that advantage, but doesn't perform quite as well as the Gripper.
For a track car, I don't think it's worth it. As a Burpspeed team member (oh yeh!) I've seen the time difference in races when they didn't have one on the car last year, to this year, where they have a Quaife fitted. Both Tony and Jay say it's great, and they definitely feel the difference coming out of the corners, but they are racing, so every second counts.
On a track car, there are much better ways of spending your money, namely more track days
A Gripper is a hero choice. Only reason I didnt go for one in my Rover was the fact I'd not be able to do a full european tour on one as the rebuild schedules are pretty tight. Depends upon milage/money set aside for upkeep. Best thing about the Gripper is if you snap a shaft you can still drive as its a true LSD, unlike the Quaife where you'll be going home on the back of a trailer.