I'm not saying finding the Titanic wasn't important but archaeologically speaking it is far less important than the Mary Rose.
On the one hand we have the Titanic which sunk in 1912, we know virtually everything about, it's design, it's passenger list etc. Heck we even have
film footage of it.
On the other hand we have the Marry Rose which sank in 1545 and (according to Wikipedia) "The surviving section of the ship and thousands of recovered artefacts are of immeasurable value as a Tudor-era time capsule. [...] The finds include weapons, sailing equipment, naval supplies and a wide array of objects used by the crew. Many of the artefacts are unique to the Mary Rose and have provided insights into topics ranging from naval warfare to the history of musical instruments.".