I would say the Concordia over the TC actually... The Concordia was, as Loaf so eloquently penned it, the "Hero Ship" after Wing Commander II according to a lot of the books and I can remember it being a total let down seeing the Concordia blown apart... even though at that point I'd never flown off her.
True. I don't have WCII, 3, or 4. And I only played WC1 once, so I don't really know.
But what about the Excalibur? The killer of Kilrah?