I have Quaife on my m135i but can't compare to MP diff.
The LSD essentially makes e diff redundant. E diff works by applying brakes to spinning wheel. This in combination with ECU taming the power means you are slowing down. With LSD traction under power is higher for longer. Helps to balance the car, feeling of rear pushing the car round bends is more evident, reducing both understeer and steering input.
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