Why is black Angus considered the best cattle breed?

Marketing techniques thanks to the American Angus Association. In honest reality though, it is not the best breed, as there are hundreds of other breeds that exist that are better than Angus depending on the conditions, climate, topography, management practices etc. they are raised in. But most people believe that "Angus is best" because of its ability to gain a good quality beef carcass, has good calving ease, good milking ability, good fertility, little problems with pinkeye, prolapse, etc., can be raised on just hay and pasture, bring premium market value for the black calves (especially in the USA), etc. However, there are plenty of breeds that can match or even Excel the Angus breed in any or all of these categories. For instance, Gelbviehs do just as well or better than Angus in all of the above. Brangus or Brahmans do much better in the South or in hotter environments than Angus cattle because they are built to resist the heat, insects and humid environment that Angus cattle would just melt or suffer in.