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" drive bays than its competitor. This superior internal configuration makes it the more versatile choice for users prioritizing high-density storage solutions and modular hardware support within their system build.

Users who require extensive storage space should select the be quiet! Dark Base Pro 901 for its superior bay count. Conversely, those who prioritize out-of-the-box cooling hardware should opt for the NZXT H9 Elite (2024), which provides a 33% advantage in the number of included fans. Choosing between these two cases depends entirely on whether your primary build requirement is maximizing internal drive capacity or simplifying the initial cooling setup.