What makes them so overpowered? The moving starbase, gravity well moving starbase, phase stabilizer, and their titan is exceptionally hard to kill, but other than that the economy is weak and its tough to defend.
Well right now gravity well moving starbases and striped to the core, depending on the faction, but even before Rebellion they were probably the best with phase missiles, stabalizers, Kosturas and Skirantras. In competitive play though if you're defending, that usually means losing. In a game I played last night for example, our teams front line was a VR and a VL. Both successfully starbased their closest opponents home world, and both immediately rushed to Starbase mobilization and SttC. Before long the Rebel player had several starbases defending our territory and even raiding their economy player's planets, and by the time their only intact player sent his sizeable fleet at us both me and our other Eco player (both TEC Rebels) just built Novaliths and they called it a game.
So is it generally agreed upon that the Transcendia is the most powerful or durable starbase? I am able to hold off waves upon waves of enemies with its 2 upgrades of meteor shower, in my opinion one of the best researches in the game
Most powerful. The Argonov might take more hits but since the Transcendia can take out torpedo cruisers with meteor storm it doesn't really work that way in practice.