Sirloin Cap, Picanha, Coulotte, Top Sirloin, Top Butt, as they sound, the top of the sirloin. Tri-tip is the Bottom of the sirloin primal. Since tho top portion of the sirloin is less active it is more tender than theTri-tip. More expense but frequently on sale is a Boneless Strip Loin. On the Bone this is the larger muscle of T-Bone and Porterhouse Steaks...JJ