It doesn't make a difference. SATA I will handle the throughput of rotary platter hard drives. Sata 3 Gbps and 6 Gbps only matter if you have an SSD. While the technology of the drive does matter the connection speed doesn't if the two are equivalent.
Drives vary widely in transfer rates, the more important items are: RPM, seek time, you cna also look at burst and sequential read speeds but generally these are less important than the first two.
Think of the various SATA standards as advertising bikes that can go "15 MPH, 30 MPH, 60 MPH", you still have to have a person that can pedal at that rate to reach it