I've been eating strictly grass-fed meat for the past 6 months and have enjoyed it. However, today at a friends house all he had was grain-fed from the supermarket so we cooked it up. It was perhaps the most delicious steak I've ever tasted. I expected some watered-down version of grass-fed but for some reason it was delicious.
One point that may be pertinent is that this is the first "fresh" meat I've had in 6 months that's never been frozen. Perhaps this may account for the taste difference?
In looking for some further information on this I came by this quote by The Bear:
"What the animal eats is not going to matter so far as nutritive value is concerned, so long as the animal was healthy. A plant may indeed be dependent on its nutrition, but the animals we use for food have the ability to manufacture in their bodies or with the aid of commensal organisms living in their intestines, many if not all of the nutritive substances they require which may fall missing in their diet. Food animals are herbivores, they live on feed which has the lowest level and format of organic-nutrient value on the planet- they are highly evolved, complex organisms which are specialised in converting low value feed into high value meat. Any proposal that the nutrient quality of meat is different due to what the animal is fed is only propaganda serving a special interest, like the organic farming mob. There is no nutritional difference between 'organic' meat and any other kind- except of course, the cost per unit to the buyer.
It really doesn't matter which red meat you eat, all are much the same other than texture and flavour. Likewise with fowl. It may matter with fish, they vary in a lot of ways, some are downright deadly poisonous. The flesh of a healthy animal is a complete food, it is not what they eat, only that they eat enough of whatever it is to thrive and be healthy. Variety in food is a human social-concept. A herbivorous animal will eat whatever plant of the specific group they are evolved to eat that is available unless or until that plant's natural protective toxins cause distress.
Sheep bison and cattle are grass eaters. Deer and goats however are browsers, and will eat almost any plant except grass. The problem with grain as food for the grass-feeding ruminants, is that the natural bacteria in each of the various 'stomachs' are not very good at digesting it. Feedlot cattle are fed a bacterial mix which replaces the normal flora with ones which can digest grain. I do not think this is a particularly good idea, but it in no way damages or lessens the nutritional value of the resulting meat."
It has been ingrained (horrible pun, my apologies) in me that grass-fed is the best and it no doubt is in terms of the animals well-being, but does the feed really reflect that much in the meat?