[juppy]

I have a 20" Craftsman that works wonderfully. We also have an old Stihl that used to be my dad's. I have used both and don't notice anything "better" with one or the other. Now don't get me wrong, Stihl makes excellent products, but so does Craftsman, Husqvarna, Poulan, etc.
Alot of it DOES have to do with how much dirt you hit and how well the oiler is working. If the oiler gets plugged, the chain gets hotter and stretches faster. The dirt will dull the hell out of the blade quickly. The first chain I used on my Craftsman 20" went to hell in a handbasket really quickly, and I thought "Oh great, this thing's gonna be a POS." The second chain we got though, I kept it out of the dirt and other "non-wood" things and it stayed sharp alot longer and didn't stretch as much.
As for Stihl being better or not, I don't know whether they make their own chains or not (can't remember). I do know that I used to make fun of my uncles Homelite chainsaw and the Oregon chains he uses on it. I got to checking on my Craftsman and guess who the chain is made by? Oregon! Stihl may be the same way, dunno.