The be quiet! Dark Base Pro 901 is the objective winner of this comparison, securing six out of eight total specification categories. Its most significant advantage is its storage capacity, offering 200% more 3.5" drive bays than the competition. This superior hardware configuration makes it the more versatile choice for users prioritizing internal expansion and component support over other factors.

Choose the be quiet! Dark Base Pro 901 if you require extensive storage options and a high-capacity chassis for complex builds. Conversely, select the Phanteks NV5 if your primary goal is budget efficiency, as it holds a 48% advantage in MSRP. While the former excels in physical utility and bay count, the latter remains the more cost-effective option for those who do not need the additional storage space.