A common problem with existing NLE stations is that they do not have open PCI slots. Typically the slots are filled with second video cards or scsi cards for local disk array or removable media. Depending on the type and age of the system, 100BaseT might be built in, but an open slot for the fiber channel HBA is required. Regarding network capability, 10BaseT can be utilized in a prototype or small SAN implementation but a 100BaseT or faster network connection is recommended for production environments. The answer to this is more of a user preference, assuming that the workstation has open slots and there are no PCI conflicts.
Most users like to have a local storage option.
From a maintenance and support point of view, a great deal of incompatibilities and troubleshooting can be avoided if all software is at the same level. If the building is already wired for optical or if you have greater distances between devices, optical would be a better solution. It is also possible to mix copper and optical in a SAN to meet the specific distance needs of the individual station. Technically, in all but the smallest shops a switch is recommended over a hub. Fortunately switches have started on a technology price curve which will continue to make them more attractive.