When I was a kid growing up, my guess is that the ratio of cattle breeds in this area was 75% Hereford, 25% Angus, and just a minute smattering of Shorthorns. The other breeds had not made an appearance at that time in Cherry County, Nebraska.
My grandmother's brother gave his opinion to me, in probably about 1960. He said, "If you sell calves, probably Angus would be the way to go. Angus calves are easier fleshing and weigh more at weaning time than does a Hereford. If you sell yearlings, go with Herefords. They seem to catch up with Angus calves during the winter and outgain the Angus during the summer. Hereford yearling steers weigh more than Angus yearling steers on average." Those were the wise words of an oldtimer, and who was I to dispute what he had to say.
Another friend who was a generation older than me had lots of observations and experience from working on different ranches in different parts of the American West. His opinion was that Angus cows make the best mothers, but he qualified that statement by saying that when range conditions became bad, the Angus cow would stick with her calf and they would both die. A Hereford cow, he said, wasn't that good of a mother, and when things got tough by way of drought or blizzard, the Hereford cow would abandon her calf to save herself. That sounds unheroic on the cow's part, but at least the factory would still be alive and functional.
All I know is what I have observed from listening to lots of old cowboy stories through the years.