Z-score will preserve the shape of the distribution, and you will be able to compare them, such as noticed if one or more skewed than the others.
Here are box plots of five variables using raw values and using z-scores.
Of course, with the z-scores you don't need to repeat the Y axis as I have, but I did want to point out the idea of parallel coordinates here as an alternative to z-scores. That is you leave the data as raw values and show the native axes side-by-side (parallel to each other).
It works for any univariate display. Here are histograms.