Although more images shot in various scenarios would be needed for a final decision, the image showing the same night scene as captured by the iPhone XS and the Pixel 3 that was posted on Twitter by Google's Marvin Chow has a clear winner. However, Apple still has to add a dedicated night mode to its handsets and, once that happens, things might change.
https://www.notebookcheck.net/Night-shots-battle-The-iPhone-XS-has-no-chance-against-the-Google-Pixel-3.401166.0.html