The NZXT H9 Flow is the objective winner of this comparison, securing more total spec victories than the Hyte Y40. The most impactful advantage for the NZXT H9 Flow is its included fan configuration, which provides a 100% improvement over the alternative. While the Hyte Y40 holds a 9% advantage in MSRP, the superior cooling hardware included with the NZXT H9 Flow makes it the more robust option based on the provided specifications.

Choose the NZXT H9 Flow if you prioritize out-of-the-box cooling performance and want to avoid purchasing additional hardware to complete your build. Conversely, select the Hyte Y40 if your primary goal is to minimize your initial expenditure, as it offers a 9% better MSRP. Your decision should rest on whether you value the immediate utility of the included fans or the lower cost of the case itself.