Note that tech reports are usually not refereed and web pages are never refereed. Journals are forums for storing finished products. Workshops report new and formative ideas. Conferences are a half-way point between workshops and journals. Typically, authors take their good conference papers, expand them, and turn them into journal articles.
Conference is better than workshop.
But don't ignore workshops. International publications are better than national. In the Australian context, researchers save their best ideas for international forums. This is true in many other countries, except perhaps the United States. Short is better than long.