If all of them went through the music, martial arts and memorization test, then Linghu Chong would win hands down.
He can play the Smiling Proud Wanderer song to perfection, such a rare song would surely impress HYS.
Martial arts wise, he might lose but he will still put up an impressive showing with his DG9J that looks more impressive the stronger his opponent is. People tend to say that Ren Wo Xing is at least as strong as a LOCH Great, and HYS was looking for a son-in-law precisely in that time period. Well at the end of SPW right before he got married, LHC would be very close in skill to Ren Wo Xing, so HYS would surely approve of his martial arts even if he loses to the likes to Xu Zhu.
And his memory would be the best among all of the contestants. Heck, he can memorize nearly all of the D9GJ in 1 recitation with only a few errors.
And of course, Linghu Chong being an anticoformist yet still chivalrous would be highly appreciated by HYS.