There isn�t a ton known about the armors, other than you originally spawn with a default "light armor" Additionally players will be able to certify in several other armor types. Below is a list of the known armors.
Infiltration Suit
Agile Exo-Suit
Reinforced Exo-Suit
MAX or "Heavy" Armor
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There ya go! Oh and Infiltration Suit = Stealth Suit, Reinforced Exo-Suit = Medium Armor.