There is no doubt heterosis (hybrid vigor) is real, but our experience with it in the past, if undisciplined, created many problems in the cowherd. System 2 allows you to capture the high growth and yield in the feedlot from both the steers and heifers produced, but requires replacement heifers to be purchased or a portion of the herd be bred Angus.
The decision of breeding system to use should be carefully thought out. If you currently have a cowherd, it should be carefully evaluated. Your resources should be considered, along with your marketing opportunities. Your breeding systems decision need not be permanent, but needs to be re-visitied from time to time. It should only be changed, however, for sound economic reasons not fads.