Unless you are a student or friends with multiple teacher it would be hard to compare good bak mei.

In Guangzhou a large Bak Mei school is taught by Siu Ting Fun. His bak mei differs from most in Yuen Long Hong Kong. The difference in the kiu, Siu Ting fun stresses more the tendons on the kiu & woon ging vs in Yuen Long it is still the chum, tun,toe from the dan tian.

With Siu Ting Fun his ging explosion from the dan tien is alot faster into his kiu and woon.