Ah well, you have two very extreme flavours of flagship Android there. The Galaxy S24 Ultra is hands down the better phone by some distance - better chip, comparable cameras, that Stylus and a stunning display. What the Pixel 9 Pro XL has is Google's smarts in the form of AI features, which work brilliantly on the bigger display (the Pixel 9 is too small in comparison). Does the Pixel 9 Pro XL also have better cameras? Perhaps, but it is kind of difficult to tell. The Pixel 9 Pro XL is really for those in love with Android, the S24 Ultra is more of a smartphone.