Why Stainless?

1) Because it doesn't rot (true for 300 series or austenitic)
2) It has comparable strength to standard framing steels. And much increase ultimate strain to failure generally. Young's Modulus and density about the same as carbon steel.
3) It looks gorgeous
4) Many austenitics are very weldable; typically 304 used for example
4) Did I mention it doesn't rot!?

Why not stainless?

1) It is more expensive to buy
2) It is more expensive to machine in some cases
3) Threads and Fasteners in stainless tend to gall easily
4) It has a much higher thermal expansion coefficient than carbon steel, like 9.5 to 6

Personally I like it. Kitz