CowCop-
This is a good question, and there are some good answers here. BUT- it depends upon what your Environment happens to be, that is - where you are located geographically, and whether you are selecting for Maternal Cow--Calf operation, or selling weaned calves for feedlot Terminal operation, or raising females for Replacement heifers for Terminal production , or Maternal cow-calf crossbred bull production or - or - or. . .
And we come right back to the old BASICS of ANY Beef operation. The Genetics and Phenotypical appearances are more critical than which particular combination of breeds are significant - not that they are not important, because they certainly are!
DOC HARRIS