As someone who has a slightly unhealthy obsession with shipwrecks and ships in general, it's mostly because compared to most ship disasters, the Titanic has much more information publically available and has a greater presence in modern culture, resulting in more books movies and other things being made on it than compared to something like literally any lake freighter accident which is much more horrific and much more unsurvivable than the Titanic. The general public however does have more familiarity to the Titanic because of the type of people who went down on it. The Titanic claimed the lives of people such as John Jacob Astor who was the 12th rich person in the world when he died, if I recall correctly, while the crew of the Edmund Fitzgerald , for instance were all working class sailors from the Great Lakes.