Battery Life Drain test of the iPhone 15 Pro Max, plus the iPhone 15 Pro, iPhone 15 Plus, iPhone 15, iPhone 14 Plus, iPhone 14, and iPhone 13, and iPhone SE3!
Comparing 15 to 15 pro, it seems the recurring theme is that the pros are inefficient at gaming. Everything that prompts peak performance also brings max wattage, killing the battery. But they otherwise perform about the same.