Erm the Rms Qm2 is almost 7 times more expensive and far larger and far more luxurious. Mauretania was NOT owned by the white star line, Titanic was a rip off Olympic, so she would never be given the title greateset ship ever.

Yes the iron was not of todays standards true, but it was the best of the time, though it was only 1 inch thick, but even today hiting an ice-berg is goin to cause dammage to the hull. She sank because of fatal flaws in her desing within the ship. Flaws that white star spaird no expence to rectify on titanics near identacle sister ships.