The creamy, crumbly blue cheeses are going to be the strongest. Roquefort is definitely the winner in the strong blue cheese category.
Blue cheese is a general category of semisoft cheeses with blue or blue-green veins running through their creamy white foundation. Roquefort cheese is a type of blue cheese, native to Roquefort-sur-Soulzon, France. There is a special type of mold that grows in the village's caves called Penicillium roqueforti.