https://www.cnet.com/news/iphone-xr-vs-xs-is-the-xs-camera-worth-another-150/

But if you're looking at them off the phones, on the same computer screen for example, you'll have a hard time noticing any differences when it comes to your everyday photos of people, landscapes or objects. That's because in theory they should be exactly the same. The iPhone XR has a 12-megapixel wide-angle lens with an f1.8 aperture and optical image stabilization. This happens to be the iPhone XS' main lens too -- the one you'll use to take the majority of your shots that aren't in portrait mode or zoom. And both have the same image sensors, the same software for processing and the same new Smart HDR feature that Apple added to the cameras in its 2018 iPhones: the XS, XS Max and XR. (The XS Max has the exact same dual rear camera as the XS, too -- it's just got a larger screen.)

This sunset shot looks great on both phones: the colors in the sky look vibrant, while the city on the bottom looks sharp despite the challenging light.