Well, the quaife is a torsen style, using worm gears to transfer torque. With one wheel off it will be open too. For every day use a torsen/quaife is good, smooth operation, pretty quiet, and normal maintance. The kaaz can be noisy (what I've read) and requires frequent fluid changes. But its the price paid for max performance.
Parking Lot Hero
2008 WRX daily driver
2003 ZX3 23D Autox Car 42 FSP
"Hella Functional - Raced, Not Hard Parked"