The difference is first stainless Steel is more expensive than (blued) chrome molly. Most of the top barrel makers use stainless steel for most of their top end barrels because they are a little softer and a lot easier to hand lap to get a super smooth finish on the inside of the barrels they will also tell you they either can't or won't spend the time and effort to get their chrome molly barrels as smooth. Either way the barrels come smoother in stainless steel. Most shooter go for the stainless steel. They break-in a little faster and for that reason they clean easier quicker. Stainless steel barrels don't last any longer. There are people that think the stainless steel barrels are more accurate that is not true a good chrome Molly barrel will shoot every bit as good as a good stainless steel barrel. More of the top class shooters use stainless steel barrels than chrome molly barrels therefore everybody think they are better. The reason for this is most top barrel makers make a lot more stainless steel barrels than they do chrome molly so there are a lot more available. Both are good the choice is up to you.