在oracle中for in和游标执行效率一样吗?

如题:在oracle中for in和游标执行效率一样吗?如下两种循环执行效率一样吗?
方式一:
for cur_value in (select id,k1,k2,k3 from TB )
loop
//业务操作
end loop;方式二:
CURSOR cur_subs IS SELECT subscriber_id FROM TB;
   OPEN cur_subs;   FETCH cur_subs INTO subid;   WHILE cur_subs%FOUND
   LOOP
      //业务操作
      FETCH cur_subs INTO subid;
   END LOOP;
close cur_subs;