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You will need to define what's better for you. In reality, both cars have similar qualities, albeit different retails. You will need to choose which one to buy according to your tastes.

The ZL1 is an excellent all around Camaro that will do most things well. It also happens to be an excellent handler.

The Z28 is an excellent track car that focuses on track performance. It will have exceptional handling (stock), but at the expense of everyday comfort features.

Good luck.