Stainless steel comes in many forms. I know when I rebuilt a motorbike that stainless steel wasn't recommended for certain high stress uses. Wheel spindles and cylinder head bolts for example.
However there are stainless steels that will cope with those stresses. Parts made from the stuff are very expensive because it's so difficult to machine.
Spokes are forged, so I don't know if any of that is relevant really!
So basically, in answer to your question, I dunno!
The general consensus among many wheel builders is to stick to 'a name' Sapim, and DT Swiss seem to be the names bandied about a lot. I doubt there's much between them tbh.