Woah! ... those two are chalk and cheese: the Kifaru Lost Park is for seriously cold temps, and can stand up to crawling. The Cirrus is a lightweight option for warmer temps and lower pack weight, but is not as robust. Two different beasts; two different uses. Both are great for their intended use though!
I'm starting to look into puffy jackets for this fall. From first impressions, I really like Kifaru LPP, but I'm not trying to be a Kifaru whore so if there's a better puffy out there let me know.