The Thermalright Peerless Assassin 120 and the Thermalright Phantom Spirit 120SE reach an objective tie across the evaluated specifications. While both coolers share identical performance in one category, they diverge in their primary strengths. The Thermalright Peerless Assassin 120 holds a 10% advantage in MSRP, making it the more cost-effective option. Conversely, the Thermalright Phantom Spirit 120SE provides a 5% improvement in TDP rating, offering a slight edge in thermal management capacity.

Budget-conscious builders should prioritize the Thermalright Peerless Assassin 120 to take advantage of its superior MSRP. Users who require the highest possible thermal dissipation capacity should select the Thermalright Phantom Spirit 120SE for its improved TDP rating. Since both units perform equally in the remaining metrics, your final decision should depend entirely on whether you value the 10% cost savings or the 5% increase in thermal handling capability for your specific build.