SawTroll
Information Collector
Before I got my chain grinder I used to file them and it did seem like Stihl chain was harder. The Oregon and others filed easily but the Stihl seemed just a little softer than my file...
The chrome is thicker on the Stihl chain, making them a bit harder to file/harder on the files..
The thicker chrome also means that they can't get as sharp as Oregon chain - but for most people that's just theory. With "race" chain it is a factor though, you hardly hear of anyone using Stihl chain for that...