Should I buy a polarized or non polarized power cord?

Should I buy a polarized or non polarized power cord? 2 slot non polarized power cord Fosmon 2-Slot to Standard Power Cord Dual Pin Non-Polarized Universal Replacement Power Cord for Gaming Systems, Printers, 2 pocket folders with business card slot C2G 6ft 2-Slot Non Polarized Power Cord - 18 AWG - NEMA 1-1 USD $

2 pocket folders with business card slot Description 6ft 18 AWG 2-Slot Non-Polarized Power Cord Replacement power cord for laptops, VCRs and other

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