In the exploration of personality theories, various approaches highlight different aspects of human behavior and characteristics. One significant theory is the trait theory of personality, which focuses on identifying and measuring individual characteristics. A well-known figure in this domain is Gordon Allport, who emphasized a comprehensive understanding of personality traits. However, another prominent figure, Raymond Cattell, proposed a more systematic approach using factor analysis to measure personality traits. Considering these theories, which statement correctly identifies the primary difference between Allport's and Cattell's approaches to personality?