Is USPS Priority Mail or First Class faster?

Related questions

1. Are USPS Priority Mail boxes free?
2. What is the difference between Priority Mail and Priority Mail Express?
3. Does USPS Priority Mail have to be in a priority box?
4. How does USPS Priority Mail work?
5. Is Priority Mail more expensive?
6. Are Priority Mail envelopes free?
7. Does USPS deliver after 5pm?
8. Does USPS deliver priority mail on Sundays?
9. Does USPS refund for late delivery?
10. Can you use your own envelope for priority mail?

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