The Lian Li O11 Dynamic EVO is the objective winner of this comparison, securing a lead in four out of eight evaluated specifications. Its most significant advantage lies in its storage capacity, offering 200% more 2.5" bays than the alternative. This superior drive support makes it the more versatile option for users prioritizing extensive internal storage configurations over other features.

Choose the Lian Li O11 Dynamic EVO if your build requires maximum drive density for high-capacity storage needs. Conversely, select the Phanteks G400A if you prioritize out-of-the-box cooling performance, as it provides a 100% advantage in the number of included fans. Each case offers distinct strengths, so your decision should depend on whether you value additional storage bays or a more complete pre-installed fan setup for your system.