Don’t you see that the face colors on the pixel are not realistic, she looks dead white. Also try zoom into her face, you will see how much worse the quality is as well
I think both the Pixel and iPhone Plus take some of the best mobile camera photos out there. The Pixel is much, much better at low light. However, the iPhone reproduces colors in a more realistic way. Most Pixel photos usually seem to have a harsher color tone, brighter/whiter, very cool like LEDs. The iPhone seems to favor a more warm color temperature, which I think generally produces worse low light photos, but more accurate color reproduction.
As for color, that is somewhat up for debate. I would say that the color of her lipstick in the iPhone looks unrealistic and she's probably not nearly as tan as the iPhone makes her look.