I am now curious about the Banks Brake. Anyways when I was last researching was told BD has better midrange retarding power and pac better top end retarding power.
In a post recently, differnt forum, a person said they have BD and buddy has pac. He liked pac better. I asked why. Told me it slowed down quicker. Also said that the BD unit held braking power to a slower speed.
So mixing these two together, I determined that the Pac with better top end retarding power gives better initial deceleration but falls off sooner as the speed decreases. BD with better midrange does not give quite as good initial deceleration, but holds its deceleration longer.
Like Bob says, cant go wrong either way.