The be quiet! Dark Base Pro 901 is the objective winner of this comparison, securing victory in five out of eight evaluated categories. Its most significant advantage lies in storage capacity, as it offers 67% more 2.5" drive bays than the competition. This superior internal configuration makes the be quiet! Dark Base Pro 901 the more versatile choice for users requiring extensive drive support within their system build.

The Phanteks XT Pro Ultra is the ideal selection for budget-conscious builders, as it holds a 37% advantage in MSRP over the alternative. While the Phanteks XT Pro Ultra lacks the extensive drive capacity of its rival, it remains the superior option for those prioritizing lower initial costs. Choose the former for maximum storage flexibility or the latter if minimizing your total expenditure is the primary goal for your PC assembly.