All those materials numbers are worth thinking about, but the real truth about application to bikes is vastly different after welding, and the ability to form ceratin shapes in those materials. You cannot extrude stainless for example.
"100% stainless" is a meaningless term, there are >50 alloys of nickel, chromium and steel with different properties.

One big weight adavantage of SS is that it does not have to be painted or coated.