During the brief time they were separated starting just before Yeung Gor lost his arm and ending at the time of their reunion and wedding at Chung Yeung Temple, Yeung Gor and Little Dragon Girl had each vastly improved their martial arts abilities. Only a short time (days? weeks?) had passed since they had last seen each other, but during that time, Yeung Gor had consumed snake organs that greatly boosted his inner power and had begun training with Dook Goo Kau Bai's Heavy Iron Sword. At the same time, Little Dragon Girl had learned the Left/Right Hand Technique from Chow Bak Tung and consequently, was able to perform the Double Sword Attack by herself (without Yeung Gor's assistance). In a short time, they had each grown from upper mid-level fighters to near sub-Greats level.
The approaches to Yeung Gor and Little Dragon Girl's improvement, however, were quite different. Yeung Gor had achieved much greater *power*, and his new fighting techniques de-emphasized stealth and skill (hallmarks of his earlier fighting style) in favor of more raw power (as characterized by the Heavy Iron Sword Technique). Little Dragon Girl, however, improved her skills. Her inner power did not improve as a result of learning the Left/Right Hand Technique, but her improved skill meant she could handle Greats-level threats such as the Golden Wheel Monk credibly.
But which member of the couple was the better fighter at that point? If someone brainwashed Yeung Gor and Little Dragon Girl into fighting each other at that point, who would win? It seems like it would be a very close match...too close to call.
Interesting note: although Yeung Gor and Little Dragon Girl needed each other to be happy, from this point forward, neither would need each other in terms of *martial arts* combat. Up until this point, Yeung Gor and Little Dragon Girl's advantage lay in their ability to fight as a team. Separately, they were not world-beating fighters. Together, with their Double Sword Attack, they could hold their own or perhaps even win against Greats-level fighters. After Yeung Gor learned Dook Goo Kau Bai's martial arts and Little Dragon Girl learned the Left/Right Hand Technique, however, each was able to handle almost any threat individually. Indeed, after Yeung Gor lost his arm, he and Little Dragon Girl never fought in tandem again for the remainder of ROCH. They had become independent of each other as fighters (which is ironic considering they had become closer in all other ways).