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

KFC, McDonald's and Burger King are among the top 71 fast food companies 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. From a global perspective, 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 vary according to regions and personal preferences.