[Kekuso]

I went to a car wreck store or whatever (where they sell car spare parts from wrecked cars) to see if they had any nice rads.
The salesman first showed me an aluminium rad that looked like some thick pipes with fins on, no tanks or anything, just a thick long pipe bent around with lots of straight fins on it. I asked him if he had any copper rads, and he showed me one that looked like most heatercores i've seen, squeezed honeycombish fins and tanks or whatever it is on the sides.

Wich design is the best? And does it make big difference if its Al or Cu?

edit: I read a review on some wc systems, and in one of the systems, the rad looked like the alu rad i saw. I think the review said it was an "conductor", not a radiator. Is that true?