So is it worth it to buy meat at Rush's favorite new advertiser or should I just stick with Stop and Shop?
Certified Angus Beef is nothing but an advertizing gimmick cooked up by the Angus Beef Association. Angus cattle tend to be slightly smaller and put on more fat than do some other breeds, and as a result their meat is slightly more marbled and will occasionally grade higher.
They are bred and born and raised in the same pastures as any other breeds. They are shipped to the same feedlots, fed the same feed rations and killed at the same packing plants. They are sorted off in the coolers for the extra profit from the marketing gimmick. They are no more organic, nor are they any more nutritive than any other steer killed that day on the line.
If it makes you feel good to spend more money for your meat, then go ahead. You will only be gaining a small amount of fat for the difference.