That's interesting. I certainly do not claim to be an expert in raising cattle. Perhaps there are smarter ways we can raise cattle. Is that why the grass-fed label is so important?
It kind of depends on your priorities, whether taste, animal-welfare, cost, etc. I think grass-fed tastes better, but I do find it has less marbling. Check out The Omnivore’s Dilemma.
https://en.wikipedia.org/wiki/The_Omnivore's_Dilemma