Performance topic: If with multiple || or switch case?

I have a small script to format the prices depending on the origin of the user.
My question now is what is better performance wise?

function FormatPrice($Price) {
        $Locale = $this->Locale;
        switch ($Locale) {
        case "en-GB":
        case "en-IE":
        case "he-IL":
        case "mt-MT":
        case "zh-CN":
            return number_format($Price, 2, '.', ',');
        default:
            return number_format($Price, 2, ',', '.');

        }
    }

or

function FormatPrice($Price) {
        $Locale = $this->Locale;
        if ($Locale === "en-GB" || $Locale === "en-IE" || $Locale === "he-IL" || $Locale === "mt-MT" || $Locale === "zh-CN") {
            return number_format($Price, 2, '.', ',');
        } else {
            return number_format($Price, 2, ',', '.');
        }
    }

Thanks in advance!