Both are fantastic research tools. It just depends on whether you only need secondary sources, or whether you need a more complete legal research tool. OnLAW Pro has an updated, modern interface for its secondary sources, along with additional features such as copy with citation, typeahead search assistance, and the ability to use both Boolean terms and connectors or natural language search. In addition, OnLAW Pro is seamlessly integrated with CEB’s primary law research tool, including our TrueCite case law citator. See our product pages for OnLAW and OnLAW Pro to learn more.