When deciding between 'Super Thinking' and 'The Great Mental Models', it depends on your depth of interest. 'Super Thinking' offers a broad overview of mental models with a clear structure and visuals, suitable for casual reading and quick referencing. On the other hand, 'The Great Mental Models' delves deeper into applying mental models practically, providing insights on collecting and using them effectively. While 'Super Thinking' lists numerous models in its index, it lacks guidance on when to apply them, unlike 'The Great Mental Models' which focuses on seven models with detailed usage examples.