yea........ thanks to that chrom plate they put in the second stage to retain heat, but thats in favor of some other divers.
u cant realli put them side by side and point which one is a better buy, because however similar, they have different designs. One of the biggest different is the dry seal feature of the apeks, another is that apeks has an overbalance design that increases airflow as depth increases instead of maintaining it. Generally speaking apeks are more expensive than the legend series though not by much. The confusion is probably caused by the fact that they 2 are just different branches of the same company.