360 DVD drives are all about as loud as each other, there are differences but they aren't that great. I've had extensive use of all the different types, and I would be hard pushed to say one is quieter than another.
Llammas site doesn't show the Liteon, which is essentially identical to the BenQ in appearance. Chances are you have a Liteon if it's a new console manufactured in the last quarter of '08, but if you use the wires colours as a guide on that site, and look at yours, if your wires have a yellow tint to them it's a Liteon.