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Thank you for your inquiry. In regards to the smoothest, they are both exactly the same, because they are both printed on the same type of FDM 3D printers. There would be virtually no difference texture wise.
The difference is purely in the PLA/PETG plastic quality. Each type of plastic has its advantages and disadvantages with our customer wanting one or the other depending on their intended purpose. I suggest doing some research on line regarding PLA and PETG to determine what's best for you.