Prime grade beef has the highest possible amount of marbling with less than 4% of beef making this grade. When compared to Prime, AAA-grade beef has only small amounts of visible marbling but is a very high-quality grade of beef nonetheless that will provide a juicy, tender cut of beef that is resilient in a variety of cooking methods. With only a slight amount of marbling, AA-grade beef is a slight step down from AAA-graded beef but will provide an excellent eating experience.