Nice post newbie! Just kidding. Good info though, i'm impressed! I can't comment on the Yeti, but the 3S Phoenix is warm! I had to sell it because I don't like using a pad under my legs.
I did buy an incubator to replace it though!
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I have both--got the Yeti with the WBBB from Brandon, then couldn't resist the Black Friday sale prices for the 3S Crowsnest/Phoenix. They are both excellent underquilts. The Yeti is lighter, a bit narrower and shorter, and of course not as lofty. Both have kept me warm sleeping in an unheated bedroom in my hammock in Jan. I suspect that the Yeti may fit the WBBB a bit better, but both work fine. It may come down to how low, temp wise, you want to go. We're really lucky to have such a great cottage industry making such fantastic products