I think it is different from person to person.
To me black liner makes my eyes look small, so I don't use it, also I am very fair.
Everyone can look in a mirror and make a choice about what they like best.
If you have questions as to which looks best on you, you can always try one color on one eye and different color on the other eye.
"Animals are not my whole world, but they have made my world whole" ~ Roger Caras