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That's not an easy answer. The vendors are making it harder by not giving you sufficient info for an informed decision. If you ask a few further questions, you'll find that the three tubes in the copper radiator are smaller than the two tubes in the aluminum radiator. Typically, the copper tubes will be around 5/8", aluminum tubes 1" or more. I know of one vendor offering "4 tube copper cores", but the tubes are just 3/8". What's critical to cooling isn't the number of tubes, it's the contact area between the fins and tubes. As a gross generalization, there will be more contact area with the larger tubes, but that's also going to depend on the pitch of the fins. Material is less of a factor: copper transmits heat better than aluminum, but copper radiators are assembled with lead, which doesn't transmit heat well. So aluminum has a slight advantage because it's brazed.
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