It depends on the indvidual woman. Wing chun is very good for women based on the concepts and theory's that lie within the art, to say any martial art is best for any large selection of people like a gender is never really going to be conclusive without a lot of experimentation that would be rather inpractical. What i feel is first and formost in martial arts for women is having a teacher who understands the female has different strengths to work on than men. Beyong that though, all teachers should recognise how each individual is different and will work in different ways. But thats all just common sense.