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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