Disk I/O on SCSI drives is going to perform slightly better than SATA-II with NCQ, and more so on a highly taxed system. i.e. you will barely notice a difference until the drives or CPU become really busy. Without NCQ, the difference will be larger.
Some SATA drives available with 16 megs cache, but not so typical on SCSI drives of that size. Also, most SCSI drives spin at 10K RPMs, or even 15K RPMs, whereas the SATA drive in question spins at 7.2K RPM, so that's a fairly noticeable factor there.
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