I've had a decent run of having the latest or near-latest iPhones and Pixels for a while now, and after shooting lots of photos with each, it's always come down to the iPhone is better at these and the Pixel is better at those, but "these" and "those" switch around a lot as generations go by. A generation or two ago, the Pixel just plain out obliterated the iPhone at in-motion night shots (example: monorail at night at Walt Disney World), and the same-gen iPhone blew away the Pixel for most day shots. I look forward to the 8 Pro arriving shortly so I can compare with the 15 Pro Max and figure out - again - which phone to use when. The images in this article suggest to me that there will be definite times to use each.
But, as many have said, they're all - meaning any flagship - good enough for most people, most of the time, and they all can mess up at times. I'm enjoying the overall improvement over the years, but I've also been disappointed in just how much post-processing occurs by default. It leads too often to zoomed-in images having a watercolor look. I see that in the 15 Pro Max. I'm sure I'll see it in the 8 Pro.