I prefer female Asian doctors too. To me it seems like they are more dedicated on average because it's something that they really wanted growing up, their dream..
Some male Asian doctors on the other hand seemed like they were forced into the field growing up...even if they have other dreams, their parents said, NO!
In a nutshell, many Asian boys are pushed to be doctors while many Asian girls are encouraged to marry a doctor instead of becoming one...from my observation...