Thunderbolt replaces FW800 nicely and is well populated with unique products that offer performance that USB 3.0 can't match today. Yes, Thunderbolt products cost more, but you get more.

USB-C is just a connector. It can do many things, including USB with speeds up to 10 Gbit/s, although many ports are limited to 5 Gbps and a good number of cables are limited to 480 Mbps.

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The new single-bay Sans Digital models that will take advantage of the UASP feature are the TowerSTOR TS1UT+B (Black Finish with eSATA and USB 3.0) and the TS1CT+ (Silver Finish with eSATA, FW800 ...

A USB 3.0 connection requires five conductors, and the connectors are blue in color. Backward compatibility is typically provided by including four additional conductors, as shown in the image here.

There are a few ways to differentiate USB 2.0 and 3.0 ports and connectors. The easiest way is to check if the USB port has a splash of blue color inside, which signifies the newer USB 3.0 interface.