Differing stainless steels are of different properties of course. Yet the generalization! A fundamental problem with stainless is the antithetical quality of corrosion resistance and surface hardening. As better enhancing one quality, derogatory to the other. There are supposedly recent Eu research developments in technology to afford both qualities harmoniously. I don't know the efficacy or where such progress stands.
The old fashioned approach, as somewhat reflected in this Thread, member subjective experience, probably the best short of in hand comparisons. For me 'good old' 4140 genre Chrome-Moly steel does a practical, cost effective job! If I had to subject my gun to super corrosive elements, perhaps otherwise. I have a couple of vintage Remington '03 rifles of WWII vintage with parkerizing or some such, which has proven extremely corrosion resistant. The limitation of largely "exterior only" application. Little substitute for reasonable care!
Just my take
Best!
John
