I lived in South Africa for a few years and biltong is fantastic. The best of all is Ostrich Biltong which is very very dry, flavor is unbelievable. With meat having a higher risk of going bad (heat and all) the South Africans figured out a way of maximizing the meat. The basic spices are vinegar, sugar, and salt. Then spices are added for seasoning. There are lotsa recipes on line that give different mixes, but its like anything else, everyone has their favorite. The meat is really not that important, nor is the cut, at least relative to making biltong. I've use roast cuts, steaks, flank steak, whatever is cheapest with the least amount of fat. However, it is easiest to eat if you cut cross to the fibers of the meat instead of getting long tough pieces. Anyway, that's my two cents.