I have mixed feelings about copper vs. lead. I've been giving copper a try, but have only used it twice. First was a 150-grain Federal copper into a bear. Killed cleanly, but the expansion did not impress me. In 2020, I tried a 165-grain copper (same Federal type as the 150 before). This bear was treed, and I was forced to shoot through the upper arm. In this case, I was very happy with the performance, because it smashed through the bone. Bear was dead before he hit the ground. Yes, I was picking fragments out of bear meat, but as it was copper it didn't concern me from a health standpoint.
So based on my tiny sample, I suspect the copper holds together better but I have yet to see good expansion. The cheap Core-Lokts and Federal Fusions seem to expand better.
Now that I'm not using .308 for bear, my commercial round selections are very limited. Last year I tried a Federal Vital-Shok, which judging by the drawing appears to be about 80-90% copper. Not helpful from a legal standpoint, but if meat contamination is your concern, much better than standard cup-and-core.