STD, Quaife, wavetrac, Torque biasing type
std- quiet, mediocre performance can still spin inside wheel when cornering and wont work if one wheel is off the floor better than nowt-
Quaife- quiet similar operation to oem, slightly better performance but still can spin wheel
Wavetrac- as both above
Spoon, Kaaz, J's etc, plate type diffs
Noisy, clunking and banging when turning at low speed, can snatch when cruising, BUT ultimate performance, no spinning inside wheels and still drive when one wheel is airborne. very aggressive for road use and not for the faint hearted, They need maintenance but only every couple of years, if its a track car it probably never will need looking at as it wont do enough miles.