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

Users prioritizing budget efficiency should select the Arctic Liquid Freezer III 240 to capitalize on its superior MSRP. Those who have sufficient chassis space and prioritize the physical scale of their cooling hardware should choose the Arctic Liquid Freezer III 420 for its substantially larger radiator. Your final decision depends entirely on whether your build requirements favor cost savings or the increased surface area provided by the larger radiator design.