On the one hand, sirloin and tri-tip have a lot in common. They're both from the sirloin primal cut (with the exception of sirloin tip steaks, which come from the round). This means they're both from ...
Sirloin is a primal cut, further down toward the rump of the animal from the rib. Steaks cut from muscles get more work than ribeye, which also makes them a leaner choice for grilling.
As a joint, these cuts are usually sold boned and rolled, but they can be cut in a number of ways, such as for T-bone, tenderloin and fillet steaks. For roasting, the sirloin is best kept whole as a ...