The vinyl membrane bridges all cracks and moves continuously with the sub-surface. The single ply system has been proven in the roofing and waterproofing industry to be a superior method of protecting surfaces subject to a lot of movement.
Many good liquid coatings fail where the metal flashings join the sub-surface, or overlap each other due to the continual movement. They rely on adhesion to the metals. The sheet system completely covers the metal flashings, which will eliminate potential leaks at the junctions.