Generally speaking, the grades and consumption levels of these three fast food brands are similar, but their rankings may be different in people's minds according to different regions and consumption habits.

KFC, McDonald's and Burger King rank among the top 70 fast food enterprises in China, while Dicos ranks fifth. This ranking may be influenced by different regions and consumption habits, so it is impossible to generalize which brand has a higher grade. Globally, McDonald's is one of the largest fast food chain groups in the world, while KFC and Burger King also have extensive influence and market share in the world respectively.

In short, the grades and consumption levels of these fast food brands are quite close, and the specific rankings may be different according to regional and personal preferences.