Is stainless that much better than copper?
How about brass?
I guess I really ought to get a hammer chisel set.
Brass will be a better choice than copper as it is more corrosion resistant.
Brass will still corrode more than stainless steel and has a lower melting point and softer. In Jlopp's tests most of the higher rated ones uses stainless steel or titanium except one which used copper and you can see that it corroded quite badly.