Between this and the new stoic down sweater, which is the better choice, in terms of warmth, quality, function, and style?

I have the Stoic luft and have felt the Patagonia sweater. The Stoic luft is about an inch thick in the front and back panels so is a lot warmer than this for a lower price and the same weight. The luft has a very nice athletic fit as opposed to the sweater's looser. I'm really happy I went with the luft. The luft uses 15 denier fabric and I think this uses 30, so it'll be a little more durable. I'd go with the Stoic piece since neither are really shell pieces so the fabric strength isn't a huge issue.

Warmth: patagonia (800 fill as opposed to 750 in the stoic) unless you really work up a sweat, the stoic has synthetic insulation underarms, which works better than down if wet, but not as warm as down when dry. Quality: unknown. edge to patagonia because they are proven. stoic hasn't be proven to have either good or poor quality. They do use good fabrics though and backcountry doesn't sell crap. Function: edge to patagonia. It has more seams across it to keep the down in place better, packs into it's own pocket, but the stoic has more pockets (like cup holders in cars, not crucial but you expect many well placed ones in the nicer models.) The synthetic insulation in the arms of the stoic is going to affect compressibility, not as good as down. Style: That's up to you, but I think the stoic looks slightly better with contrasting zippers and the two chest pockets. Take all of this knowing that I own the patagonia, but haven't tried the stoic.

I've got this one with a hood and am partial to it over the stoic. I think patagonia has a better fit and, as of now, a better reputation. Not that stoic is a bad line, its just new. Good thing is though, backcountry has an awesome return policy so really you're safe with either one!