The only nose wheel brake that I am familiar with was on G-APUX Hawker's original Hunter two seat demonstration aircraft. It was very effective, in the way that the front brake on your bike is better than the rear one. As you brake the nose (aircraft or bike) dips and forces the braked wheel even harder onto the ground improving retardation. In the Hunter the measured reduction in landing run due to the nose brake was (by chance) the same as streaming the brake chute.
The downside is weight (a long way forward) cost, maintenance and most of all sorting out the leg and its mounting structure to carry the enormous drag loads that are trying to snap the leg backwards. The brake chute had the advantage that it was lighter overall and worked on runways covered in water, snow and ice.