Serial ATA II is an expansion of Serial ATA 1.0
Serial ATA = is a type of physical interface. It's the way Hard Disks, CDROMs etc connect to the motherboard. Like the Parallel IDE interface but newer and faster. Another type of interface is SCSI
RAID (Redundant Array of Independent Disks) = is a system of using multiple hard drives for sharing or replicating data among the drives (taken from
here) it's used to provide faster storage or failure tollerance of storaged data or both.
u see they are not the same thing so u can't compare pros and cons. But with a SATA u can have RAID(also with SCSI but costs a lot) but with the older Parallel IDE u can't.