Rounder
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Carlton and stihl seem about the same hardness. The carlton I have is semi chisel and the stihl chisel. Stihl will out last oregon as far as staying sharp but in most places near me it's 1/3 to 1/2 more per loop. If you buy stihl by the roll then the price is very close. Cutting speed for me is about the same since I grind them from new before I ever put them on a saw.
None of them cut worth a #### utill they're ground or hand filed..I like the Oregon CL/CLX because it is a titch softer, easier to give a quick brush file to.
PS...Mike, where do you get the Stihl chain by the roll for a comparable price to Oregon?....PM if you like - Sam