Beef grading comes down to marbling, the flecks of intramuscular fat that melt during cooking and carry flavor through the meat. More marbling generally means a richer, more tender bite.AAA is Canada's everyday premium grade, with moderate and consistent marbling. It is a reliable, well-balanced choice for a weeknight steak. Prime is the top tier of graded beef in North America, with noticeably more marbling and a deeper, steakhouse-style flavor.Wagyu goes further still. American Wagyu, a cross between Wagyu and Angus cattle, has more marbling than Prime with a richer finish. Purebred Japanese Wagyu, usually graded A5, sits at the...