The Phanteks G400A is the objective winner of this comparison, securing six spec victories compared to the single win for the Lian Li O11 Air Mini. The most impactful advantage for the Phanteks G400A is its superior cooling configuration, which features 33% more included fans than the competition. While the Lian Li O11 Air Mini offers a 100% advantage in 3.5" drive bay capacity, it falls behind in the majority of measured categories.

Users prioritizing out-of-the-box thermal performance and a higher count of pre-installed hardware should choose the Phanteks G400A. Conversely, the Lian Li O11 Air Mini is the better selection for builders who require extensive storage support and need to house a high number of 3.5" drives within their system. Selecting between these two cases depends entirely on whether your build demands additional cooling hardware or increased internal storage capacity.