iPhone with the A17 Pro chipset beats the Tensor G4 in terms of raw horsepower, but the Pixel 9 Pro XL has 16 GB of RAM, (I got the 1TB storage model) Pixel OS, and the Tensor G4 is optimized for on-device Gemini AI integration with Gemini nano models built-in. I just set it up, so I'm only now getting a feel for it, but these reviews may be helpful in answering your question.

https://www.phonearena.com/reviews/pixel-9-pro-xl-vs-iphone-15-pro-max_id6344

https://www.androidauthority.com/google-pixel-9-pro-xl-vs-apple-iphone-15-pro-max-3471046/