White or Black? It basically depends on the water quality in your pond.
White crappie do well in murkier water or water that is occassionally clouded with clay or silt partricles and or persistant plankton blooms; visibilities commonly 2' - 2.5 ft or less.
Black crappie will grow better than white crappie in relatively clear waters, those frequently with visibilities of 3ft or greater.
Surveys have frequently shown the above information to be pretty consistant when both species are present in the same water body.
