You can find some information about the difference between them, visit link
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So i think the answer is "quite" :))
And this's the conclusion:
- Quite is more force than Rather
- Rather is often used to describle "sth bad, unsuitable, etc" :))
- Quite may be used with a, the, or some and a noun, but Rather is only used with a.
If there's sth wrong, please correct it. Merci.