The Phanteks G400A is the objective winner of this comparison, securing six spec victories against the single win held by the Lian Li O11 Air Mini. The most impactful advantage for the Phanteks G400A is its inclusion of fans, which provides a 33% improvement over the competition. Conversely, the Lian Li O11 Air Mini maintains a distinct edge in storage capacity, offering 3.5" drive bays that represent a 100% improvement over the alternative.

Users prioritizing out-of-the-box cooling performance should choose the Phanteks G400A for its superior fan configuration. This case is better suited for builders who want a complete thermal solution without purchasing additional hardware. Alternatively, the Lian Li O11 Air Mini is the ideal selection for users who require extensive internal storage space for multiple 3.5" drives. This model is specifically designed for those who prioritize high-capacity data management within their system build.