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  • $\begingroup$ Thank you very much for your reply. $\endgroup$ Commented Dec 11, 2014 at 15:14
  • $\begingroup$ Because counta[z_] := Count[z, a_, Infinity] gives a smaller Count for Hill1 (130) than for mat1 (158), I thought that using ComplexityFunction -> counta in my Answer above might drive mat1 to Hill1, but it does not. Strange. $\endgroup$ Commented Dec 11, 2014 at 15:34
  • $\begingroup$ I guess that FullSimplify[Expand[Hill1]]; FullSimplify[Expand[mat1]]; FullSimplify[Expand[Hill2]]; FullSimplify[Expand[mat2]]; is the best we can get. Myself, I am pretty satisfied with your answer. $\endgroup$ Commented Dec 11, 2014 at 15:43