So, that being the case, I'm not sure bead blasted stainless would be super scratch resistant. I had a slide-on style 2 piece iFrogz case on my iPhone 4. It was felt-lined and super soft on the inside. I thought there would be zero chance of the phone getting scratched inside the case. I took the case off a couple of times so that people could see the phone in person without the case on--it was quite the coveted item at the time--and noticed that the sliding action left long scuffs down the sides of the antenna band. It was heart breaking. And those kind of marks cannot be repaired, especially on a bead blasted finish.
So I guess if I had to choose between that and polished stainless, I'd choose the polished. I will say that on my iPhone X and XS Max, the stainless definitely got scratched up similarly to how a piece of silverware would. It was mostly just from taking the case off now and then to clean out grime. Funny thing is, just KNOWING that I could polish it out was good enough for me. I never actually did it. I just liked knowing I had the option. Verizon didn't seem to care about any micro abrasions when I turned either phone in. I got full value.