Stihl and Oregon semi skip square ground is the fastest stock chain I've ever used for both hardwoods and Fir.
Yeah, it's nice stuff. I only have one 28" loop of the Stihl right now, in 3/8 .050". I ate the other I had when I hit bullets clearing blowdowns. I think I'll pick up a couple more loops next time I'm in the market. Usually I use full-comp for everything. A lot of the saws I buy come with skip chain (even with bars as short as 20"!) so I have a bunch of that, too.