This is entirely based on what ship I am equipping them to.
I'll take ECMs on an ISD2, MC80, or AF2. Advanced Projectors is good on ships that will die without the extra damage soak, such as CR90s. Advanced Projectors is also good as a second defensive retrofit on the MC80 Assault Cruiser. This is less about Xi-7s and more about the sheer number of blue dice being thrown now to get those accuracy rolls.
ANOTHER good defensive Retrofit is Redundant Shields, which can be combined with Engineering teams to let a medium or large ship constantly regenerate 3-4 shields a turn.
Edited by thecactusman17