I have both Prem ACDC and Metallica pro.
I too would rank them ACDC Prem - Metallica Pro - ACDC Pro.
For what Metallica Pro and ACDC PRem are going for I would save my pennies and go Prem while you can or get someones HUO on the second hand market.
ACDC pro is just missing too much IMO- played one on location.
ACDC Prem is the standard by which all Prem will be judged.