Antiseize in plumbing? Alternate screw heads and materials for screws securing washers?
Stainless will be stronger than brass , so less likely to strip. Assuming a brass stem , galvanic corrosion should not be a problem. The stainless is unlikely to gall with the brass shaft. A wrap of teflon tape/dope will help prevent sticking. I have found plain screw driver slot or Philips to be good enough but a stronger head is good if you can find it.