The Arctic Liquid Freezer III 360 is the objective winner of this comparison, securing more total spec victories across the evaluated categories. Its most significant advantage is a 10% improvement in noise level compared to the alternative. While the Arctic Liquid Freezer III 420 offers a 17% larger radiator size, the 360 model provides a more balanced profile that ultimately edges out its larger counterpart in the overall technical assessment.

Users prioritizing a quieter computing environment should select the Arctic Liquid Freezer III 360 for its superior noise performance. Conversely, those who require the maximum radiator surface area for their specific build configuration should opt for the Arctic Liquid Freezer III 420. Choosing between these two coolers depends entirely on whether your primary requirement is the acoustic benefit of the smaller unit or the physical dimensions of the larger model.