Spray foam vs rigid board, my 9 month comparison is done

I insulated two identical 20 foot containers back in February. One got closed cell spray foam, the other got rigid foam board with taped seams. The foam board container hit 85 degrees inside during that July heatwave, the spray foam stayed at 74. That was a 10 degree difference for about $400 more total. Has anyone else run a side by side test like this or was I just being obsessive?

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