Higaran use more Railguns, Pulsars, and Ion Cannons. Think the Torpedo frigate, and Destroyer are the only Higgy ships that use missiles. While the Vayger ships use less guns, and more missile attacks. Fighters, and Bombers are about the same for both sides. Vayger use a "lance fighter" which is a laser armed ship, and a laser corvette. Higgys got the gunship and pulsar vette.
BOTH factions would fit TEC. Since the differences in tech between the two factions are minimal. Vayger can only fit certain types of build mods on its carriers while the higgys can build anything up to a frigate with its carriers.
In Homeworld 1 the Kushan, and the Taidan were virtually identical, and almost evenly matched one for one. Each side had only one or 2 units that were "unique" to the faction.
When u gonna finish the SoA 2 UI? or did u give up on it?
Scale in HW is kinda messed up. The original Kushan MS was supposed to be like 5km from top to bottom, but the Pride of Higara is like 1/2 the size of the original mothership. Yet it pumps out ships twice the size of a Kushan carrier. Use your best judgement as far as scale goes.