我是否使用PHP while loop或SQL group\u concat

这两种代码的作用相同,但哪种代码更好使用以及何时使用?

PHP方法

$names = [];
$Query = "SELECT DISTINCT name FROM names";
$stmt = $conn->prepare($Query);
$stmt->execute();
while ($name = $stmt->fetch()) {
    $names[] = $name['epic'];
}
$names = implode(',', $names);

SQL方法

$Query = "SELECT GROUP_CONCAT(DISTINCT name) AS names FROM names";
$stmt = $conn->prepare($Query);
$stmt->execute();
$row = $stmt->fetch();
$names = $row['names'];