I would say that it depends on what your real interest is? Operating systems or storage management? The system administrator position has been around a bit longer than the storage administrator position, so you may be a bit more marketable if you pursue a storage administrator role with EMC Clariion storage technology as a primary focus. EMC storage arrays are everywhere, and Solaris is quickly being supplanted by Linux, so I would recommend storage administration or Linux administration with a concentration in storage management. Just my opinion.