English Breakfast Tea is usually a blend of several different black teas, including the heavier Assam, Ceylon, and Kenya teas, and has a strong flavor that is ideal for serving with greasy English breakfast foods.
Earl Grey, on the other hand, is a dark tea with citrus as the main flavor, blended with fruit peels such as passion fruit zest or lemon zest for a blend that is light enough to be savored on its own or served with snacks.
Overall, English Breakfast tea is for those who like a strong flavor, while Earl Grey is more for those who like a refreshing taste.