There is no doubt that black sunglasses are the coolest shades. If you are not sure what color sunglasses to wear when you go out today, then black is the best choice, they are as natural and indispensable as taking your keys with you when you go out.
If you are talking about the color of the sunglasses frames, then yes, it is the best. However, the lenses shouldn't be darker. It is best not to have sunglasses lenses that are more than 80% black, otherwise, they will be visually impaired causing danger, especially when we drive.