The mean.
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The median.
you need to be more specific with your question!!
never * * * * * When the data are qualitative. The mean and median are unusable in such cases and the mode is the only sensible measure.
the median is perferred when the data is strongly skewed or has outliers. =)
Central tendency will only give you information on the location of the data. You also need dispersion to define the spread of the data. In addition, shape should also be part of the defining criteria of data. So, you need: location, spread & shape as best measures to define data.