I've never shot a VAIS brake, but I have shot other "ported" / "hole" style designs. In "general" the ported/hole style brakes are less effective than the more modern style of brakes that have larger, slot-shaped holes or have impact "plates". This class of brakes would include our BA, CB, the Barrett factory brakes, the AI factory .338 and .50BMG brakes, the Armalite .50 brake, the Badger FTE style, etc. In general, the effectiveness of each brake amongst this general style is proportional to the amount of surface area on the impact places, and to some extent the angle of the reflecting surfaces. Again having not shot the VAIS specifically, but having shot other ported/hole style brakes, I would expect the CB to reduce recoil better.