What's the difference between MBTI and Enneagram?

MBTI measures how you process information and make decisions (4 dimensions, 16 types). Enneagram measures your core motivations and fears (9 types with levels). MBTI is functional; Enneagram is motivational. Together, they're more complete.

Which is better for relationship compatibility?

Neither predicts compatibility perfectly. But Enneagram is arguably better because it reveals patterns you *choose* (defense mechanisms, growth edges). MBTI just shows preferences. Understanding why your partner does what they do (Enneagram) is more useful than how they think (MBTI).

Yes. Know both your type and your partner's. MBTI explains surface differences. Enneagram explains deeper patterns. Together, they provide a richer picture than either alone.