Oefficient of Variation and Standard Deviation

Coefficient of Variation and Standard Deviation are two measures of dispersion or spread among the data values. Lets say we have two different sets of data. Explain which of the two mentioned measures can more accurately find out which of these two data sets has more spread or variability in its data values. You can select 5 values for each of the two data sets and practically calculate the standard deviation and coefficient of variation for each data set to clarify your explanation.