If its outright performance you are looking for and these are your two choices then go for the Dragoon. As for the Cuirassier, although better than stock coolers or indeed no cooler at all just doesn’t perform to a great enough extent to warrant spending more on an aftermarket cooler.
Bottom line: Whilst both units are solidly constructed there is no doubt that I would rather spend money on the Dragoon.
Xigmatek Dragoon deserves a healthy 4/5.
Xigmatek Cuirassier wins a modest 3/5.