Originally Posted by
St3v3
In terms of internals, it would be more or less the same
The advantage is the 9Yin + QKDNY doesn;t need any other martial arts to start fighting. This is different with 9 Yang + QKDNY has 0 fighting ability and need to learn other martial arts through "cheating". 9yin, if this is really created to encounter QKDNY could also cover its weaknesses (if there is any).
The disadvantage is: 9Yin + QKDNY has less autoprotection ability and protection from poison. The other is the rate of recovery from injury is also take longer time.
GJ who already master 9 Yin version and WCY could also master QKDNY is relatively short time although I doubt they could do it in 6 hours only.