TEC Rebels: you receive those controllable Pirate ships, still not sure which of the techs is needed for this - Insurgency? Pirate Mercenaries? Liberated Resistance?
Advent Loyalist: you can subjugate enemy ships with your Titan
Advent Rebels: you can ressurect some of the ships, they will pop up at your homeworld
Vasari Loyalists: you cam summon Dark Fleet ships thanks to the Titans internal Fleet Beacon
I have not played for Vasari Rebels yet and cant think of anything in regard to TEC Loyalists... am i missing something?