Which is the best writer between 811s and 851s?

Hi,

I want to buy a Liteon DVD writer and I am stucked between 811s and 851s.

These writer seems to write at the same speed and the price is the same.

Could you tell me what are the real differences of these drives and wich is better ?

This question has been posted and answered many times already.

Here’s one: http://club.cdfreaks.com/showthread.php?threadid=88632