The be quiet! Pure Base 500DX and the Phanteks G400A are tied in this objective comparison, as each case leads in three out of eight measured specifications. The be quiet! Pure Base 500DX offers the most significant advantage in storage capacity, providing 150% more 2.5" bays than its competitor. Conversely, the Phanteks G400A holds the primary advantage in cooling hardware, featuring 33% more included fans to support system airflow out of the box.

Users prioritizing high-density storage configurations should select the be quiet! Pure Base 500DX to take advantage of its superior 2.5" bay count. Those who prefer a pre-configured cooling solution without needing to purchase additional hardware should choose the Phanteks G400A for its higher number of included fans. Both cases offer a balanced set of features, so the final decision rests on whether your build requires more drive mounting points or immediate fan integration.