....Although it costs more, I would venture to suggest that a 'limited slip diff' is more effective. And if you add the Whiteline AntiLift Kit as well...............
I agree that a Quaife ATB would be a better option - but only under hard traction. But it is a seriously expensive bit of kit, and requires major modification, consisting of "open heart surgery" on your gearbox. The Whiteline kit will work during acceleration, constant throttle, trailing throttle, or even harsh braking!

Pound for pound, and comparing the results, the LSD is way more expensive and less "efficient per ££££" when compared to the relatively cheap Whiteline kit. Furthermore, the Whiteline kit can easily be reverted back to OEM, to re-sell at a later date - and you would recoup your costs from a 2nd owner. With the LSD, it is extremely doubtfull that you would ever revert it back to standard, and unless you seriously found a buyer for your car who genuinely appreciated and understood the benefits of Quaife, then those mega bucks will be all but lost