Alliance are a serie of different mods. On the Star Wars GC, you can play the civil war Empire vs Rebel era + Black Sun and soon the Republic and CIS.
This is a small example about the improve from the IA. Now each unit will attack a type of unit according to their capabilities. By example A-Wings are interceptors and they will attack enemy bombers, X-Wing are superiority fighters and they will try clear the space from enemy fighters.
So, your units will prioritize enemy units that they are best capable of fighting, right?
Yes.
wow this explosion looks amazing