Weymouth offers broad space for horse tongue. Weymouth is an English leverage bit. Weymouth gives a good lifting action without upper palate interference,Generally, they are to be used in more advanced riding, where the horse must be more responsive to the rider's aids. If misused then it tends to be very painful for the horse.
Bridoons work in the exact same way as a snaffle, it has thinner mouthpiece and smaller rings then a snaffle and sits above the curb to regulate horizontal flexion,