The Phanteks NV5 is the objective winner of this comparison, securing victories in seven out of eight measured specifications. Its most significant advantage over the Lian Li A4-H2O is its maximum cooler height, which is 236% greater. While the Lian Li A4-H2O holds a 7% advantage in MSRP, the Phanteks NV5 dominates the majority of the technical categories, making it the superior choice for users prioritizing hardware compatibility and cooling flexibility.

Users should select the Lian Li A4-H2O if their primary goal is to minimize the initial purchase cost, as it offers a 7% better MSRP. Conversely, the Phanteks NV5 is the ideal option for builders who require substantial clearance for large cooling solutions. By choosing the Phanteks NV5, you gain significantly more room for hardware, whereas the Lian Li A4-H2O is better suited for those specifically seeking the financial benefit of its lower price point.