The Noctua NH-L9i-17xx is the objective winner of this comparison, securing victories in two out of three evaluated categories. Its most significant advantage is its MSRP, which is 21% better than that of the alternative. While the Thermalright Frozen Prism 360 holds a notable lead in thermal dissipation capacity, the Noctua NH-L9i-17xx provides a more favorable value proposition based on the provided specifications.

Choose the Noctua NH-L9i-17xx if your priority is a more cost-effective cooling solution that excels in the majority of the measured categories. Conversely, select the Thermalright Frozen Prism 360 if your primary requirement is the superior TDP rating, which is 331% better than the Noctua model. This choice depends entirely on whether you value the overall spec-based efficiency or the specific thermal handling capacity offered by the larger unit.