Bison is a lot leaner and generally has a lower caloric content but higher protein and iron. The ribeyes are fantastic because the higher fat content, which you don't get in other bison products, contributes to an unbelievable, almost buttery flavor. Ground bison burgers have a similar creaminess to the taste. I'm pretty much a filet mignon person when it comes to beef because I don't care for the chewiness that fat provides, despite the fact the the 'flavor comes from fat.' Bison ribeyes are as good, if not better when BE grills them, than filet mignon. Also, bison almost never come from feedlots like cows often do so they are messed with a lot less than cows, in terms of antibiotics, hormones, etc.