批量插入 Oracle 数据库:哪个更好:FOR Cursor 循环还是简单的 Select?

Which would be a better option for bulk insert into an Oracle database ? A FOR Cursor loop like

DECLARE
   CURSOR C1 IS SELECT * FROM FOO;
BEGIN
   FOR C1_REC IN C1 LOOP
   INSERT INTO BAR(A,
                B,
                C)
          VALUES(C1.A,
                 C1.B,
                 C1.C);
   END LOOP;
END

或简单的选择，例如:

INSERT INTO BAR(A,
                B,
                C)
        (SELECT A,
                B,
                C
        FROM FOO);

有什么具体原因，哪一个会更好?