2 Different iMac Power Cables

I have a late 2009 21.5" iMac and have two different power cables. One is made by Longwell, the other by Valex. Does anyone know which one actually came with the Mac and/or is one better than the other? Is there one I should be using?

No one who could check what it says on their plug? I'd greatly appreciate it...

You can use any computer power cable at all with an iMac. Even the old ugly black one from the Dell you bought ten years ago. They are all interchangeable.

Thanks for the reply.

To put your mind at rest, a new iMac comes with the white Longwell cable.

Thanks.