I think you guys are full of it.
How can you tell if it's the chain, operator, wood density, impurities in the wood, or a million other factors that make your chain dull?
I run several different saws with a mix of different chain size, cutter type, brand and complement, and there's no way casual observation could determine which brand lasts longer.
And what if one chain is slightly softer than the next, doesn't that make it easier to file? And doesn't thicker chrome, which would make it last longer, also make it cut slower?
Perhaps a sawyer, cutting cants, without any bark, with perfectly clear wood, could do some kind of comparison, but you wood ticks making these unsupported statements have no credibility with me.