The be quiet! Dark Base Pro 901 is the objective winner of this comparison, securing five category victories against the two won by the Lian Li O11 Air Mini. The most significant advantage offered by the be quiet! Dark Base Pro 901 is its storage capacity, as it provides 150% more 2.5" bays than its competitor. This substantial lead in drive support makes it the superior choice for users prioritizing extensive internal hardware expansion and storage flexibility.

Users who require maximum storage density should choose the be quiet! Dark Base Pro 901 for its superior bay count. Conversely, the Lian Li O11 Air Mini is the better option for budget-conscious builders, as it holds a 59% advantage in MSRP. Selecting between these two cases depends entirely on whether your primary requirement is the high-capacity storage offered by the former or the cost-effective value proposition provided by the latter.