The best book I ever read on the subject was Walter Lord's A Night to Remember from 1955. It was adapted into a film by the same name in 1958.
The book takes incredible care to show every angle of every "moment" from the sinking, as Walter Lord interviewed dozens of survivors who were still living at the time. It includes loads of direct quotes from his interviews as well as recollections of specific things spoken by specific people on April 14th, 1912.
The film, for its part, is also very good. I enjoy the spectacle of James Cameron's 1997 Titanic, but there's nothing quite like a well-made historical drama from 1958. The full movie is on YouTube, as well as the full audiobook.
I don't really know where I was going with this. Just some thoughts, I guess.