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.