Ball mill vs Roll mill refiner

what are the differencies?

Hi All, 

i am doing some research on the pro/cons of having a ball mill refiner or a roll mill refiner for chocolate.

i have spoken to chocolate makers that have a ball mill machine and they wish they had a roll refiner and viceversa!

The final output (chocolate) is the same, the process slightly different. but wich one is better than other?

As small batch chocolate maker like many out there nowadays, soon or later we will have to encounter this dilemma. Maybe this topic can be used in the future by others.

Thanks for the input!

Antonino