Also surprisingly, MacWorld has an article about USB3 vs Thunderbolt, and USB3 came out on top using non-SSD drives
This article wasn't testing RAID drives, so yes USB3 works quite well for single drives provided your computer is fairly new and uses 6Gb/s SATA drive connections. Once you add RAID drives and bi-directional data processing (reading and writing data simultaneously), USB3 falls far behind.
