From my experience on my mkiv - I had vibratechnics mounts and they were noisy in terms of putting vibrations into the cabin.
Car drove very well with them, though - very little drivetrain movement & absolutely no slop, but the rear view mirror was shaking when stationary...
I had the same car fitted with a Quaife diff (mounts were sold off very soon after fitting!), and it made no more noise to my ears than the standard box. Grip was transformed though...