You would think that the Carja would be head & shoulders above any of these factions. Given for the sizeable army they have & weaponry they have developed (albeit with help from Oseram ingenuity). But, have to say that the Tenakth would be the strongest & fiercest. Considering, how the Tenakth were able to hold their own against the invading Carja forces during the Red Raids. Good enough that the Carja retreated from the Forbidden West.