Journals and diaries serve different purposes. Some writers use journals for more than mere documenting the facts. Journals are places where feelings, emotions, wishes and personal observations can reside, and secluded thoughts can be expressed privately.
Diaries, on the other hand, are places where the facts can be stored without persuasion of the writer’s points-of-view influencing the content. There is a place in this world for both since the two, when used correctly, serve different purposes.