The Lian Li O11 Vision is the objective winner of this comparison, securing more category victories across the evaluated specifications. Its most significant advantage over the competition is the storage capacity, as the Lian Li O11 Vision provides 100% more 2.5" drive bays than the alternative. This makes it the superior choice for users who prioritize internal storage expansion and require a higher density of drive mounting points for their specific build requirements.

The Phanteks G400A is the better option for builders who prefer a pre-configured cooling solution, as it offers 100% more included fans than the Lian Li O11 Vision. Users who want to minimize additional hardware purchases should select the Phanteks G400A for its out-of-the-box airflow capabilities. Conversely, those who need maximum storage flexibility should choose the Lian Li O11 Vision to take advantage of its superior drive bay configuration.