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 the inclusion of fans, which provides a 100% improvement in that category. By offering a more comprehensive feature set across the majority of evaluated metrics, this chassis establishes itself as the superior option for users prioritizing hardware integration and out-of-the-box cooling support.

The Lian Li O11 Vision is the preferred choice for budget-conscious builders, as it holds a 33% advantage in MSRP. Users who prioritize initial cost savings over the extensive feature set of the be quiet! Dark Base Pro 901 should select the Lian Li model. Conversely, those who value the convenience of included fans and a higher volume of superior specifications will find the be quiet! option better suited to their requirements.