Pixel 3 exclusive features seem fairly tame to me, mainly:
- Google Assistant
- Google Photos
- Nest Hello
if you use Clock app's Bedtime feature, you get a similar morning alarm view on the iPhone.
I personally don't need nor want my phone to become an "always on" device for Photos and doorbell, but to each its own.
Anyway, if you don't care for these either, you can use Pixel Stand for iPhone. Although at $79, not worth it for me personally.