Rib-eye steak is a piece of meat taken from the rib area of a cow, and is fattier than sirloin steak, with more tender and juicy meat, and a softer texture with some fatty flavor. Rib-eye steak is considered one of the more upscale varieties of steak.
The sirloin steak is a chunk of meat removed from the spinal region of the cow, and is leaner than the rib-eye steak, with firmer, chewier and more flavorful meat.
If you like soft, juicy steak, you can choose rib eye steak; if you like firm, chewy steak, you can choose sirloin steak.