Considering that the protocol that most 2.5' SSDs works over is SATA3 which is a 6Gb/s bus. USB3.0 (5 Gb/s) is fine, USB3.1 (10 Gb/s) is better, Thunderbolt 2 (20 Gb/s), great, but you probably couldn't even tell the difference. Copying gigantic continuous data such as video files would show some improvement for the added bus speed.
Click to expand.Yes, but I would argue that any noticeable different would be workload-dependent - small random files won't see you ramping up speed to full potential of the disk, let alone the bus.