I would have said technically the geared diff is the better. In theory it should be able to be setup to provide the car with more steering and at the same time equal or more drive to a ball diff due to being fluid filled unlike the ball diff. But I can never be assed to rip it all apart and try back to back
Certainly a geared diff works well if you put thick enough oil in it. 5000cst in mine like Dan's and runs really nice ... even on sandy astro
