These might be Pixel only features, but the few that always get iPhone users envious of my phone are:
Battery sharing - Turning the phone into a wireless charger for other phones, including iPhones.
Now Playing - Display whatever music is playing on the lock screen, and keep a history. Great when you're at a bar and don't want to open up Shazam or want to go back and see all the music your friend was playing in the car.
Ad Guard - Block ads, even in apps.