Either will do. Both are
excellent drive manufacturers! If you want the drive to last a little longer and perform a little more stably then get the boxed version and NOT the OEM version!
Yesterday I purchased a replacement DVD drive for my 2006 (with x5355 procs) and the salesman (store manager) had sample drives of an OEM and a boxed version of pioneer A16 open and partially disassembled. When I asked what the differences actually were pointed them out to me and talked about the problems related to the OEM ones. Basically the boxed version has dust seals, few critical parts are made of a different (better) material, and undergo precision balancing at the factory. He suggested that these differences are the main factors in a drive that typically dies in 6 to 18 months as opposed to one that will operate for 2 or 3 years.
From what I saw in his little demonstration I believe it too! And just to show me that he wasn't BSing for the extra $10 he gave me the boxed one at the OEM price.
The drive I got was the pioneer DVR-A16J-SV in a box for $52.
He said that the number one high quality drive was this one in boxed version, number 2 was this drive in OEM version and #3 was some Sony he had sitting there. I asked about Samsung drives specifically and he shrugged and said it's a Korean product but I might get lucky anyway.