Firewire is not faster than SCSI in general, although for cd-rws it generally is, since cd-rws rarely use anything faster than Ultra-SCSI. The reason for this is that no currently existing CD drive of any type is capable of even bursting faster than the Ultra-SCSI transfer rate. I would stick with SCSI for CD-RWs, due to the greater availability, and lower price. If you have a choice between the same drive in either interface at the same price, and already have both controllers, or don't have either, go with the firewire, because it is easier to deal with, is hot swappable, and are generally more portable.