I found that the Rebel titan is weaker. It always loses in a fair fight against the loyalist titan. The rebel titan should be able to beat the loyalist titan in a fair fight because the loyalist titan is meant to be a defensive/support ship, not an unstoppable tank that can be used for rushes near game-start.
1. what I think would be a cool feature: -specialise the titans to their faction's play-style ie make the loyalist titan stronger in friendly territory and make the rebel titan stronger in enemy territory.
This bonus could be conferred through military research, like the militia techs for the loyalist faction. Neutral ground would be up for grabs by both factions, but the rebel titan should beat an unsupported loyalist titan imo. The said military research could be a prerequisite to titan construction..
2. As some other testers have suggested the titan builds too quickly. Personally, I think it should take about 3-4 times as long to build with more warnings to other players.
I think these changes would be great for balance. Let me know what you think 