Sirloin, rib eye and filet mignon are all common types of steak, and their differences mainly lie in the location and taste of the steak.

1. Sirloin Steak: Sirloin steak is a piece of meat cut from the sirloin, usually with a ribbed backbone. The meat of sirloin steak is firmer, slightly chewy and elastic. It has relatively less fat content and is leaner, but it is therefore more suitable for people who like a refreshing taste.

2. Ribeye Steak: Ribeye steak is cut from the back muscle near the ribs, so it is also called rib eye steak. Its meat is relatively tender and juicy, with a certain amount of fat, richer texture and more delicious taste.

3. Filet Mignon: Filet Mignon is cut from the tender meat near the back loin of the cow. It usually has no bones and fat, so the meat is very tender. Because the meat is very delicate, there is no texture, and the taste is softer.

To sum up, different parts of steak have different tastes and characteristics. Which steak to choose depends on personal taste and preference.