@Arkham99: The Cerberus Nightmare/Spirit/Shade armor all make a Female Shepard look like a Phantom, while for a Male Shepard, like the N7 Slayer/Kai Leng (Minus the Helmet as I think the visor he's wearing is a Delumcore Overlay... though I may be wrong).
@Meshuggala : The Cerberus Ajax Armor (From the Alternate Appearance Pack 1), Cerberus Nightmare Armor, Cerberus Shade Armor and Cerberus Spirit Armor provides more cumulative benefits than any other Armor sets. Their combined bonuses total 80%, while most full-body armors offer 60% bonuses, and individual armor pieces give a maximum of 55%.
So technically... they are better...
RIP Raychel, 29/06/2012. Beloved sister and friend (Forum poster: Ghost Rider 2099). Your light was extinguished far too early... Rest now, for one day we shall meet again.