You may not notice any direct changes in health or weight, however, grass-fed is better in many ways.
Cows are ruminants and designed to process grass, not corn, the latter being a grain. Cows are fed grain in CAFO (concentrated animal feeding operation) cause they put on weight faster and it is easy to transport and store grain than it is grass/hay.
Cows fed corn have more omega 6 fatty acids in their meat and fat (humans need a higher ratio of omega 3's, rather than omega 6's) so we could be putting our omega balances out of whack.
Good balance of omega's help with a reduction in inflammation and seem to be implicated in fighting off cancer causing agents in our bodies.
While not all grass-fed is antibiotic free and/or organic, CAFO cattle are routinely given anti-biotics because their crowded living conditions are a haven for disease outbreak. There is more likely to be e-coli in CAFO cattle as well.
While there are a lot of immediate benefits to following a primal lifestyle, some of the benefits are about disease prevention and a healthful long life.
Here are a couple of links if you want to do more reading.
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