I found out one thing on this post, I'm no good at online searching, I was on Baileys site before and didn't notice the Stihl brand chain. The price is 8$ more then Oregon, does that mean it will cut 8 times faster, last 8 times longer or comes from 8 times farther away.
I just went through 7 tanks full of gas on the Oregon chisel chain, it finally got a little dull and when I filed it, the cutters felt harder then my last chain, if that's possible.
Keep in mind Baileys is not a Stihl dealer. They are getting the chain from different dealers and reselling it so they are going to be higher. I can buy chains locally for a dollar an inch, 20'' bar the chain is $20. I did buy some chains from Baileys back in December. They were chains that the dealer did not stock. They had a deal going with free shipping on Stihl chains and if you spent $100 you got $10 or 15 off. I got a couple of other things and the guy shipped my whole order for free.
What kind of Oregon chain are you going to be comparing the Stihl to? If you are going to be cutting dirty wood semi chisel is best. You can use a broom or water hose to clean dirty wood.