IDG Answers is a community of experts who are passionate about technology. Ask a question or answer one below.
Thunderbolt is much faster than even USB 3.0, 20Gbps bidirectional, 40Gbps one way for Thunderbolt vs. 5Gbps bidirectional for USB 3.0. I haven't seen Thunderbolt in many PCs to this point though. A few Ivy Bridge laptops around my office have Thunderbolt ports, that's about it. Newer Macs do have them. The limiting factors, in my opinion anyway, has been the lack of onboard Thunderbolt controllers on PCs, as well as the ubiquitous nature of USB. With controllers become more of a standard feature you will likely see increased adoption among PC users, although I haven't felt a need to rush into it.