  We present a detailed comparison of multiple statistical grain metrics for
previously reported experimental thin film samples of aluminum with 2D
simulations obtained from the Phase-Field-Crystal (PFC) model and a Mullins
grain boundary motion model. For all these results, ``universality'' is
observed with respect to the dynamics and initial conditions. This comparison
reveals that PFC reproduces geometric metrics such as area and perimeter, but
does not capture grain shape and topology as accurately. Similarly, the Mullins
model captures the number of sides distribution quite well but not other
metrics. Our collective comparison of such measurements underscores the
critical importance of the use of multiple metrics for comparison of
experiments with all present and future models of grain growth in
polycrystalline materials.
