The phrase that best replaces the question mark in the Venn diagram comparing Daoism and Confucianism is "order and stability."
Daoism emphasizes harmony with nature and a more individualistic approach to life, while Confucianism focuses on social order, moral development, and the importance of relationships and rituals in maintaining stability in society. The concept of order and stability aligns with the essential tenets of Confucianism.