The Tridoshas form a bottom-up approach to the understanding of a personality from the atomic and cellular level, while the Trigunas form a top-down approach from the intellectual / psychological level.
The physiological correlates of the Tridoshas play a large role in determining an individual’s likes, dislikes, wants, desires, interests, achievements and the like. This allows us to predict likely behaviour and the kind of work or professional culture that they are best suited for.
Likewise, the test that assesses the Triguna combinations in a person, helps us in predicting work-place ethics, cultural ethos, leadership values, spirituality, commitment to work situations and the like.
By combining the Trigunas and the Tridoshas, we get a comprehensive personality profile of a person.