I haven't used Scientific Linux. But all the mousetech.com servers are CentOS and have been for several years. They have run very reliably, and CentOS is pretty prompt at tracking new RHEL releases, so I have several useful growth options should anyone start paying me enough to justify buying technical support.
"privilege" comes from the Latin words for "private" and "law" (legal) and dates to feudal times. To "claim privilege" meant that you were above the laws that applied to the common people.