If you’re planning on getting an iPhone 15 Pro, either get a case and use it or choose the white or natural finish. There’s a sound metallurgical reason for such a choice: you can’t polish out scratches in titanium. The previous 14 Pro used stainless steel which is much harder than titanium. Any scratches on a 15 Pro’s titanium will show as natural titanium and be far more obvious on the blue and black models. They’d be less visible on the white and natural colour finishes. My personal choice would be natural.