reverse dislocation cones... whats the difference?

as above, looking at after market suspension and see there is 2 types of dislocation cones, whats the benefits from each?

reverse - cones are attached to axle springs stay with the chassis
normal - cones bolt to chassis springs stay attached to chassis

is there any benefit from either?

I ant a clue, but if someone mentions better handling cos of less unsprung weight I'll laff an laff an laff.

i think ones type the ones that are attched to the axle are designed for use in the southern hemiphere

hahahaha... is there a diff in price? i never seen the axle attached type. i cant see why they would be any different