What's the difference between the Scarlett 8i6 and the Saffire Pro 14?

The main difference between the Scarlett 8i6 and the Saffire Pro 14 is the fact that the Saffire Pro 14 has a firewire connection whereas the Scarlett 8i6 uses a USB connection.

As well as this, the Saffire Pro 14 is bus powered whereas the Scarlett 8i6 must use an AC adapter.