Combonation simply because black and green are not a color combo at all. Black is a hue. Adding black to green will create a darker green. Adding blue to green will create a blue-green.
If you are asking if these colors will complement eachothor when placed next to eachother you have prased your question poorly. A
This answer depends. For example if it is for a kids team Jersey I would say Blue green as it is a fun happy combo that screams Childhood. However id creating a strong or classy looking adult structure such as a flag I would use Black and green