What is the best iPhone ever?

Apple has been releasing iPhones for over 11 years now, and while they've made a lot of mistakes they've also done a lot of things right. Which is iPhone is the best ever?
What is the worst iPhone ever? https://youtu.be/HAXs6uyopAY
iPhone Buying Guide: https://youtu.be/8RyJXkQn3u8

Thanks to everyone who voted!

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Timestamps:
Introduction - 0:00
Finding the best - 1:46
The top 5 - 11:04
The best iPhone - 15:20
Twitter poll - 16:35
YouTube poll - 17:07
Final thoughts - 18:03

Videos referenced:
Living with the iPhone 4S - https://youtu.be/8azbWfMY22s
iPhone 5: what an iPhone should be - https://youtu.be/QUY4sU82WoU
iPhone 5S: Forward Thinking - https://youtu.be/b2CBFK4QVRk
iPhone 6S: Unbridled Success - https://youtu.be/WuKB9QXaYec
iPhone 8: Massively Underrated - https://youtu.be/gAkVy57ixVY

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Видео What is the best iPhone ever? канала 91Tech