For me, journal writing is a place to articulate ideas so that I can sort them through and speak clearly to other people. Drawing also articulates in a way, but it is more a process of understanding. Drawing is a form of expression that brings other elements out, incidental details happen and you learn more about the experience. So perhaps writing is a way of articulating and drawing is a way of understanding and learning. I can never fully plan a drawing. I encounter it with an idea or a feeling and it pieces together in the process of creation.