RD-15A – Assault/Raptor: Favors Crit/Accuracy (DPS)
TD-15A Pyro-tech: Favors Crit/Accuracy(DPS), slightly favors endurance(over Aim) more then RD-15A
TH-15A Medic: For Merc. Bodyguards (Healing), favoring Alacrity and Crit
TT-15A Coercion: More for Shield Tech (Tanking), favoring Endurance, Absorption Rating, and Defense Rating
You can mix Assault,Raptor and Medic Gear they have the same Style (Mercenary Gear)