What's the difference between series 3 and 4 Apple Watch?

Related questions

1. Can Apple Watch get wet?
2. Whats the difference between the Apple Watch 3 and 4?
3. Can you still text on Apple watch without cellular?
4. What does the Series 4 Apple watch do?
5. What can a Apple watch do?
6. Is the Apple Watch 3 waterproof?
7. Does Apple Watch 3 have walkie talkie?
8. Does Apple Watch 3 have text on GPS?
9. Can we use Apple Watch 3 without iPhone?
10. How deep can the Apple Watch 3 go underwater?

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18. #processor
19. #faster