Simple icons are often the most effective because they're easy to recognize and understand. When icons are small, as they often are in many interfaces, intricate details can get lost or make the icon harder to interpret. So, when in doubt, lean toward minimalism to keep the user experience fluid and intuitive.

However, there are cases where detailed icons have their place. For instance, in a large-scale display or specialized applications where the icon represents a complex action or concept, added detail can provide extra context or clarify its purpose. But even then, it's crucial to balance detail with readability.