The be quiet! Dark Base Pro 901 is the objective winner of this comparison, securing a lead in four out of eight evaluated specifications. Its most significant advantage is the inclusion of 3.5" drive bays, which offer 50% more capacity than the alternative. While the Lian Li Lancool 217 trails in the total spec count, it maintains a distinct edge in affordability, boasting an MSRP that is 44% lower than that of its competitor.

Users requiring extensive storage capacity for multiple hard drives should choose the be quiet! Dark Base Pro 901 to leverage its superior bay count. Conversely, the Lian Li Lancool 217 is the logical selection for budget-conscious builders who prioritize a lower initial cost. Both cases offer distinct benefits, so the final decision depends on whether your priority is maximizing internal drive storage or minimizing the total expenditure for your system build.