Well, you're not likely to find two heatercores, exactly the same, where one is copper, and the other, aluminium.
The aluminium seems to be best at transfering heat to air (from previous discussions) where copper is best for transfering heat to/from water. Many radiators have copper tubing, with soldered aluminium fins. That seems to be the best combination of metals.
Metals aside, the (internal) design of the rad is far more important, since the airflow that we're using is very low (relatively, in mass).
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