For a aircooler the most important is the design of its base and pipes.
Freezer 7's heatpipes are very straight, the heat could transfer to a certain area of heatsinks, which is bad for its performance, the cooler is hard to handle significant air ventilation task.
T4's pipes were bent, which is good, but you may notice one of them was bent very heavily and much longer than others, it is a great drawback for this cooler, it may cause the low efficiency of heat transfer then affect the performance.