USB2 vs USB3 in respect to audio latency

A good analogy is to think of it as a drainpipe and a tennis ball. The tennis ball is the data and the width of the pipe signifies available bandwidth. With the drainpipe set at the same gradient, letting go of the ball at the top of the drainpipe will see it arrive at the bottom in a given amount of time. That’s your latency, the time it takes to go from end to end.
USB 3.0 offers a much wider pipe, which in terms of the analogy, means that it could allow a greater number tennis balls (more data) to travel down the pipe, but the balls would not travel down the pipe any faster. This is the same when comparing USB 3.0 and USB 2.0 in terms of the way they transfer audio data.

Source: FOCUSRITE