http://www.vitaletherapeutics.org/vtlbison.htm
Even though bison has less protein than beef in this comparison, bison has slightly more L- tryptophan, and far more L- lysine, cystine, arginine, and glycine than beef. All of these have their respective health benefits if properly supported by other nutrients. While soy ferments have been touted to have health benefits, the same can't be said for soy protein isolates after it has been subjected to the high degree of processing at high temperatures and in carcinogenic stainless steel equipment. This is not a hard choice for good health. Significantly, bison has half-again as much L-cystine as beef, even when beef is cooked by the method optimal for nutrition.