Push + Autothrusters. Against higher PS, turtle up and shoot. Against lower PS, grab a focus and push off the free action.
There are really no circumstances where VI Turr is going to be strictly better (because you can always turtle or br+boost but a single barrel roll or boost struggles to get you out of arc consistently and usually does nothing when taking fire from turrets), and a lot of circumstances where Push Turr is strictly better (against anything of lower PS, or taking fire from turrets).
I'm right on the money with this one.