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I will agree stihl can take a bit more abuse, this show up real fast in sandy soil, but it also will eat your files up alot faster too. When touching up 24"+ bars I'll take the chain thats easier to file over being able to hold an edge for 1-2 more cuts. Keep it out the dirt and I belive they last about the same 2-3 days of hard cutting.
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Theres your answer, the Stihl chain will cut more wood, for long, which is better, because of the higher chrome content in the chain.
Similiar to the new chain ORegon came out with that has a blue hue to the cutter tooth.