Which head/combustion chamber is better for performance? Speed master aluminum LA or aftermarket magnum iron head?

DionR said

There is no such thing as a 5.2/318 vs. 5.9/360 head in the Magnum castings. They were the same head regardless of displacement. The factory never had a different casting like they did back in the LA days.

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Can one assert that the stock magnum heads 5.2/5.9 are base level and then the R/T next level? Should the next level only be used for stroker builds?

How would that cast iron R/T head (intake runner 179cc -??) compare to the aluminum magnum head?