The Phanteks NV5 is the objective winner of this comparison, securing more category victories across the evaluated specifications. Its most significant advantage over the NZXT H9 Flow is its superior maximum power supply unit length, which provides 19% more clearance for larger hardware installations. While both cases share several identical specifications, the Phanteks NV5 offers a more flexible foundation for power delivery configurations compared to the alternative.

Users prioritizing high-capacity storage should select the NZXT H9 Flow, as it provides a 100% advantage in 3.5-inch drive bay availability. Conversely, the Phanteks NV5 is the better choice for builders who require additional space for longer power supply units to accommodate high-wattage components. Choose the former if your build relies on multiple mechanical hard drives, or opt for the latter if your system configuration demands greater flexibility in power supply sizing.