Black And Decker Mixer What Is The Difference Between Black Mascara And Brown/black Mascara?

What is the difference between black mascara and brown/black mascara? - black and decker mixer

I'm an Asian girl with dark brown eyes and black hair, and I was wondering what color mask is best for me. But more importantly, wanted to know what is the main difference between the black mascara and brown / black mascara? Thank you =]