While some cuts of beef are higher quality than others, I think that mostly related to taste and texture.
Grass Fed beef contains more omega-3 fatty acids (which are good for you), I am pretty certain that is proven
When I eat at McDonald's I generally just get their small double hamburger plain. Usually road trips or doing something where I am just stuck eating fast food.
Here are the big mac details that can be found on the web. I was shocked to see 100% beef no fillers
While this is not a steak, remove the sauce and maybe toss the top half of the bun, and you are getting somewhere for cheap
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Big Mac Bun
Ingredients: Enriched Flour (Wheat Flour, Malted Barley Flour, Niacin, Iron, Thiamine Mononitrate, Riboflavin, Folic Acid), Water, Sugar, Yeast, Soybean Oil, Contains 2% or Less: Salt, Wheat Gluten, Sesame Seeds, Potato Flour, May Contain One or More Dough Conditioners (DATEM, Ascorbic Acid, Mono and Diglycerides, Enzymes), Vinegar.
Contains: Wheat.
100% Beef Patty
Ingredients: 100% Pure USDA Inspected Beef; No Fillers, No Extenders.
Prepared with Grill Seasoning (Salt, Black Pepper).
Shredded Lettuce
Ingredients: Lettuce.
Big Mac Sauce
Ingredients: Soybean Oil, Sweet Relish (Diced Pickles, Sugar, High Fructose Corn Syrup, Distilled Vinegar, Salt, Corn Syrup, Xanthan Gum, Calcium Chloride, Spice Extractives), Water, Egg Yolks, Distilled Vinegar, Spices, Onion Powder, Salt, Propylene Glycol Alginate, Garlic Powder, Vegetable Protein (Hydrolyzed Corn, Soy and Wheat), Sugar, Caramel Color, Turmeric, Extractives of Paprika, Soy Lecithin.
Contains: Egg, Soy, Wheat.
Pasteurized Process American Cheese
Ingredients: Milk, Cream, Water, Sodium Citrate, Salt, Cheese Cultures, Citric Acid, Enzymes, Soy Lecithin, Color Added.
Contains: Milk, Soy.
Pickle Slices
Ingredients: Cucumbers, Water, Distilled Vinegar, Salt, Calcium Chloride, Alum, Potassium Sorbate (Preservative), Natural Flavors, Polysorbate 80, Extractives of Turmeric (Color).
Onions
Ingredients: Onions.