The be quiet! Dark Base Pro 901 is the objective winner of this comparison, securing victories in seven out of eight measured specifications. Its most significant advantage over the competition is its storage capacity, offering 150% more 2.5" drive bays. This superior hardware configuration makes it the more versatile option for users requiring extensive internal storage expansion compared to the alternative.

Users who prioritize maximum storage flexibility and a feature-rich chassis should choose the be quiet! Dark Base Pro 901. Conversely, the Corsair 2500X is the better selection for budget-conscious builders, as it holds a 44% advantage in MSRP. Those who do not require the additional drive bays and prefer a more cost-effective solution will find the Corsair 2500X to be the more suitable choice for their build.