In my opinion. not really. Others may have different opinions though. If you buy retail, then you don't have to crossflash in order to use the B series firmware versions. This way you don't void your warranty. Other than that, I don't see any advantages to buying the retail over the OEM version. You'll probably save some money going with an OEM/bulk version so it's up to you.
The retail version does come with some software. But, if you already have DVD burning software then you don't need it. I have two retail DW1620 burners and have never used the software that came with my drives. I prefer other apps instead. Again, it's really your choice.