The band size is according to your fat around your stomach. A man or a woman can have the VG Band, however most men who get banded will always receive the VG Band. I am sure that is what Dr. Martinez and Jessica meant.
As for the fills, the amount equals about the same.
I have 2cc my band (holds 4cc) and my friend Lance has 5cc (holds 10cc) in his. So even though we have different size bands, after having the same fills we both have our bands half full.