The USB Confusion!
USB 1, lost in the past, it was dreadful for audio. USB 2, probably still most people's standard. USB 3... much faster, and has blue plugs/sockets. Actually, faster than anything required for audio, but hey, I like blue.
USB Audio Class 1... IIRC only goes to 96KHz sample rate. USB Audio Class 2... does the higher sample rates which we don't need anyway (but another hey: believe in them or not, more and music files are going to be high-sample-rate).
At least with this class stuff, we are now talking audio. Windows (up to now? Windows 10?) only supports class 1 "native," which is why DACs come with their own drivers.
USB "Gen x..." This is just some schiit, isn't it? Brand specific to identify their own improving USB interfaces.
E&OE. Please post corrections as appropriate.