The Phanteks NV5 is the objective winner of this comparison, securing victory in six out of eight evaluated specifications. Its most significant advantage over the competition is its cooling configuration, as it provides 100% more included fans than the alternative. While the NZXT H510 Flow falls behind in the majority of categories, it maintains a distinct lead in storage capacity, offering 200% more 3.5" bays for users requiring extensive mechanical drive support.

Choose the Phanteks NV5 if your primary goal is a system with superior out-of-the-box airflow and cooling hardware. This case is better suited for builds that prioritize thermal management through its higher fan count. Conversely, select the NZXT H510 Flow if your build necessitates high-capacity local storage. The increased number of 3.5" bays makes it the more practical option for users who need to house multiple large-format hard drives within their chassis.