When considering a course in quantum mechanics that utilizes Landau's books, it's important to assess the level of difficulty. Landau's texts are regarded as more advanced than Griffiths, which may indicate that Griffiths could be insufficient if the course is already challenging. For a balanced approach, alternatives like Sakurai or Cohen-Tannoudji are suggested as they may provide a suitable middle ground between the two extremes. Engaging with multiple resources can enhance understanding, making it beneficial to explore various texts on the subject.