The conductivity of copper is about ten times that of lead. But that is mostly besides the point. Steel has a poor conductivity, too, but we don't make cars out of copper to get a better ground. It's the total resistance of the clamp, connections and cables that matters; as long as the resistance of the clamp is relatively low compared to the other parts of the circuit, the material used for the clamp isn't that important.
For that matter, clamps aren't made of pure copper or pure lead. Both metals are far too soft in their pure form. The "copper" ones are really brass or bronze. I assume the "lead" clamps are some alloy of lead, tin and other metals.
What's far more important than the material are the connections themselves. I have never seen one of the "bolt on" replacement clamps used where it didn't eventually cause a problem. I like to put a little dab of anti-seize on my battery terminal connections to improve the conductivity and prevent corrosion.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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