The Enneagram Type 1 is known as the Improver, the Reformer, or the Perfectionist, striving to feel perfect, good, right, and correct.
The Enneagram Type 5 is known as the Expert, the Observer, or the Investigator, striving to feel self-sufficient, capable, and informed.
If you're still struggling to narrow down your dominant Enneagram type between these two, this video will give you additional insight into some of the key differences, including how each of them:
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The Understanding People Cheat Sheet mentioned at the end can be found here: https://www.enneagrammba.com/cheatsheet