In DGSD, Duan Yu had the complete Beiming Shengong manual but he was only able to learn 3 or 4 pages in it before it was torn into pieces. So he could only absorb enemy's energy when that person had contact with Duan Yu's wrist.
In SPW, AoEA is a elite skill derived from Beiming Shengong of Duan Yu and Huogong Dafa of DCQ. Not only can absorb by any contact, but also the practitioner of this skill can even absorb enemy's energy through weapons.
Between Art of Essence Absorbing and complete Beiming Shengong, which is the more perfect skill?
I choose Art of Essence Absorbing.