The be quiet! Dark Base Pro 901 is the objective winner of this comparison, securing victory in five out of eight evaluated specifications. Its most significant advantage lies in its storage capacity, offering 50% more 3.5" bays than its competitor. This superior drive support makes it the more versatile option for users prioritizing internal hardware expansion and high-capacity data storage within their system build.

Users who require extensive storage configurations should choose the be quiet! Dark Base Pro 901 for its superior bay count. Conversely, those who prioritize out-of-the-box cooling hardware should select the NZXT H9 Elite (2024), which holds a 33% advantage in the number of included fans. Selecting between these two cases depends entirely on whether your primary build requirement is maximizing internal drive space or obtaining a higher quantity of pre-installed cooling units.