The Noctua NH-D15S is the objective winner of this comparison, securing victories in two out of three measured categories. Its most significant technical advantage is a superior TDP rating, which outperforms the Thermalright Peerless Assassin 120 by 14 percent. This higher thermal capacity makes the Noctua NH-D15S the more robust option for handling demanding heat loads, establishing it as the more capable cooling solution based on the provided specifications.

Users prioritizing maximum thermal performance should select the Noctua NH-D15S to take advantage of its higher TDP rating. Conversely, the Thermalright Peerless Assassin 120 is the ideal choice for budget-conscious builders, as it offers a 55 percent advantage in MSRP. By choosing the Thermalright Peerless Assassin 120, consumers can capitalize on significant cost savings while still obtaining a competitive component that holds its own in the remaining performance metrics.