Median will provide a better description of the center.
We know that in statistics, median is a central tendency of a data and always exist in the middle of the data set i.e. it occupy the central position in the data.
Hence, in the given box plot with:
Min at 6, Q1 at 7.5, Median at 8, Q3 at 23, Max at 32.5.
The median will describe the center of the data.