What is the difference between u1 and u3 SD card?

Related questions

1. What is the best memory card for Nikon d500?
2. Does faster SD card make difference?
3. What is XQD format?
4. What is UHS II?
5. Does SD card speed matter?
6. What is UHS speed class?
7. Does Nikon d750 support UHS II?
8. What is the difference between UHS I and UHS II?
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Tags

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2. #shoot
3. #class
4. #supports
5. #smartphones
6. #speed
7. #cards
8. #performance
9. #which
10. #denotes
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12. #write
13. #guide
14. #least
15. #microsd