Well, the CLMP guide is apparently focussed on literary publications. The other you cite is primarily for commercial markets but also with a good range of literary pubs.
If you're going after the lit-journal end of things, you'd do better to subscribe to a magazine such as Poets & Writers. These markets can shift very quickly. For instance, many of them publish only once or twice a year, so by the time their address appears in an annual guide, they're swamped. And it's always nice to find out that a journal's about to close its doors, rather than waiting a year or two to get the SASE.