DiCaprio takes roles in excellent films and it comes down to whether considering a favorite film, or a film where I liked his role in the film. A young Leonardo did very well in What's Eating Gilbert Grape with Johnny Depp. Although not the very best film, he was fabulous in Catch Me If You Can and I take that as his best performance.
I loved Shutter Island and The Departed, and in a close call, maybe The Departed as #1 of favorite film with DiCaprio. He is supposed to be excellent in the new film The Wolf of Wall Street, but I don't like the story line very much as glorifying criminals on wall street.
Undecided between Inception and Catch Me If You Can Titanic's better than Romeo and Juliet. At least it has awesome special effects.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.