SATA stands for Serial Advanced Technology Attachment and SAS stands for Serial Attached SCSI (SCSI Stands for Small Computer System Interface, typically pronounced as scuzzyâ€). They're two types of interface used for transferring data to and from hard drives.
I think we can all agree that you will either be getting an HDD or SSD VPS and not a SATA VPS. As SATA vps could technically be SSD or HDD. So Sata doesn't really describe what you are getting. I have SSD connected to SATA all the time