Does the white or black show the least wear? I've been rocking my titanium blue 15pro caseless and I don't want to go back. I also have a 13mini I like without it. Just don't think I can go back to cases.
My educated guess would be natural titanium as it would hardly show any scratch or light damage given the lack of colored coating. But I haven't seen any big durability issues with last year's iPhones so I think you're good no matter what