I have always preferred the mild steel rods or the steel plates.
As they deteriorate they "salt" the ground and lower the ground resistance.
We use the mild steel rods exclusively on the power lines.
Very expensive and not an improvement over copper clad.
>copper plated steel
Good choice, we use them on our Light Rail Transit trains that run
on 600 volt DC.
Never seen them, so can't comment.
Never used them, and I can't justify the cost over the copper clad steel
I hope that this gives you some direction.