As an Improved version of its predecessors the Spectral Armor and EN Heavy Talonite Armor, it offers the same improved resistances to Energy damage in addition to more health, but is more mass and repair efficient as compared to them. The High amount of Resistance allows it to effectively shrug off Energy damage from all sources, including those from the Pulse Cannon and Yellowjacket Drone.
The EN is A.X.I.S Hulls only, which limits the variety of options that this armor can offer to the player. It also pales in comparison in terms of health provided to its predecessor the EN Heavy Talonite Armor, and additionally, players prefer to use the ENAL Tungsten Armor for the Alien Resistance.
The EN is a reusable credit, while the ENAL is a Blueprint, ironically.
The EN stands for Energy in EN Tungsten Armor
The EN is however not as repair efficient as its predecessor, however, it will receive a buff in the coming update.