B6.1 gear diff rebuild

[brown4s]

In the middle of gear diff rebuild and going to order new parts and spotted the aluminium diff case, is this worth a purchase or should I stick with the plastic case ?

Replacing idler gear as well as gearbox is very notchy when rotating the wheels after rebuild at certain points in the rotation of wheels, car was a second hand buy so replacing gear diff anyway but interested in everyone’s view on the aluminium diff case and would this be better than the plastic one.

Cheers all