Final answer:
Sheldon's theory of body types focuses on gender differences in body type and personality.
Step-by-step explanation:
Compared to Kretschmer's theory, Sheldon's theory concentrates more on gender differences in body type and personality. While Kretschmer focused on the relationship between body type and psychological disorders, Sheldon proposed a theory that related body type to personality traits. He classified body types into three categories: endomorphs, mesomorphs, and ectomorphs, and suggested that each body type was associated with specific personality characteristics.