The 9 Yum White Bone Claws were quite a deadly skill. Chan Yeun Fung, Mui Chiu Fung, Yeung Hong, and Chow Chi Yerk each was able to kill a number of people using it, and none of them had great inner power, which limited them against truly powerful opponents such as the Greats.
But if one had Greats-level inner power, would the 9 Yum White Bone Claws be as great an external technique to use with it as other martial arts such as Hong Lung 18 Palms, 1 Yeung Finger Technique, Sad Palms, Iron Sand Palms, or Tai Chi Fist?