I haven't used the Kokanee, but I have used the Neutrino Endurance. The Endurance is a great down jacket, and very warm. It lofts well and feels firm. The Endurance fabric was very water-resistant too, and the water-resistant zippers are nice (though a bit tough to open and close). One of my favorite features of the jacket is the hood stay. If you're on a route, you don't want a big hood acting as a snow catch. The stay enables you to roll up the hood entirely, or treat it like a big collar. Cool feature.
So after saying all these nice things about the jacket, I sold mine and I regret it, but I got swept into the hype of synthetic vs. down. If I were to buy a mid-heavy weight down jacket again, I would definitely get the Neutrino Endurance. After my initial wariness about down getting wet, I've been slowly adding more down into my kit.
Go with the Neutrino!