In reply to butteredfrog: Citadel is marginally warmer, marginally more durable than the DAs, but heavier. But we are talking small differences - they are both top end pieces of clothing.
In reply to An Triubhas: My DAS is a decade old now so don't know what the new ones are like but my DAS is more usable for winter climbing than the citadel, but the citadel, once on, is warmer and has a better hood. Generally the citadel has more features, but if that is good or not depends on if you really need them. http://www.ukclimbing.com/gear/review.php?id=4444