Not all stainless steels are rust resistant. 316 is for marine uses and is probably not worth the extra cost for cave environments if other options are available. One model is the Pika Rock Drill, available from Adventure Gear. The problem is that neither approach works for some deep, tight, wet cave projects. From an engineering standpoint, it is much better to have drill and anchor separate.
Stainless studs are far superior to self-drives in almost every way.
So self-drives are relegated to rock climbing and caving, where Petzl is the international standard. Version 1 was published in the NSS News , October 1999.