The Arctic Liquid Freezer III 240 and the Arctic Liquid Freezer III 420 represent a tied comparison across the evaluated specifications. While both units offer distinct benefits, the primary advantage for the smaller model is its MSRP, which is 27% better than the larger version. Conversely, the Arctic Liquid Freezer III 420 provides a significant physical advantage, featuring a radiator size that is 75% larger than the 240mm alternative.

Choose the Arctic Liquid Freezer III 240 if your priority is a more cost-effective cooling solution that fits within smaller chassis constraints. Select the Arctic Liquid Freezer III 420 if your build can accommodate a substantially larger radiator, as this increased surface area is the defining physical benefit of the unit. Your decision should rely on whether you value the 27% better MSRP or the 75% larger radiator size for your specific system requirements.