I would say that America has the best of all foods on average. That is to say, it may not have the best of one particular type of food. But if you took all world-wide cuisines, America probably has the best on average of everything.

For instance, if you want the best French food, of course, France is the best. But France may not have even reasonable Chinese or Korean food. If you want the best Japanese food, Japan would win, but they may not have great Italian or German.

The USA has excellent represntations of French, Italian, Chinese, Japanese, Korean, Indian, Middle Eastern, Thai, Vietnamese, etc. The USA may not have the best in one individual category, but I think if you take it all together, it has an excellent representation of most foods in the world.