A brake needs two things to be effective at reducing recoil. One fast pressure release of muzzle pressure and second surface area for the escaping case to act against to retard the direction of the rifle put in motion by recoil energy.
The partition style brakes will dump muzzle pressure the fastest of any brake design. They also have the largest and most direct opposing surface areas for the gas to act against.
This is also why they are the loudest and most effective.
Compared to the Vias style brakes, there really is no comparision to be honest.
Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.