Solid Gold is definitely a better food than RC. As for the best flavor, I would check the ingredients list of the different formulas to see exactly what meats are in them, especially if she is allergic to fish. Also, at six months she doesn't need to be eating four times a day. By six months, my pups are eating twice a day. Just make sure she doesn't do any strenuous exercise for about an hour before or after she eats a meal or you raise the risk of bloat.