One of the things I'd miss the most if I were to switch from Pixel to iPhone is the deep Google Lens integration.
I love that I can use Lens to copy-paste any text even if the app doesn't let you.

For example, the Warpcaster app doesn't let me copy paste so I have to use Lens to do it if I want to copy my cast to paste it to Twitter. 

I use Lens all the time...

It's also fantastic for translations.

I will say I'm struggling to find enough reasons to stick with my Pixel over iPhone. Have had a "Pixel" since Nexus. My 6 has a lot of sporadic issues and app support usually starts with iOS.

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