Slide galling on auto's if improperly lubed.
That sums it up.
They are all MIM these days. Totally different.S&W for a long time returned to carbon steel hammers and triggers on their stainless guns, although hard chrome plated, because they withstood wear longer than comparable parts made of stainless steel. I do not know if they still do this.
Sounds like the only real difference is that stainless, not surprisingly, is easier to clean and maintain.
Then we know how often you wash your white car!As a side note, once you have enough revolvers, you will stop trying to scrub off carbon rings on the front surface of the cylinder. Wasted effort.
I would never buy a white car, and I say again, after you have a few dozen revolvers, you stop worrying about carbon rings on the face of the cylinder.