manual labor means to work with physical strength,however,mental labor means to work with your head.As far as i am concerned,mental labor is better than manual labor.
first,mental labor is cleaner than manual labor.People who work on mental labor always work with paper,pen,computer and so on.But people who work with manual labor often work with tools that may dirty their hands and body.
Second,mental labor is easier than manual labor.One deals with the work by using the knowledge they have learnt.But the latter deals with their work by using strength.
Third,the one who works with mental labor earns more than the one who works with manual labor.
So,from the above we can see that mental labor is better than manual labor.