Well I say, AC set is always best specially for WvW cause you need a good amount of HP (Vitality) and defense (Toughness) as well as Power. AC set have superior runes of monk which increases your healing ability , the duration of your boons increased by 15% and you gain Aegis for every elite skill you use, best of all you get 5% change to gain health while hit. I don’t know whats better than that.