A USB headset keeps the signal digital the whole way to the earcups. Conversion and amplification happen inside the headset or its inline module rather than on the motherboard, so the audio never crosses the analogue stage of your PC and never picks up the hum, hiss or coil whine that a shared ground can introduce. Your operating system treats the whole assembly as one device with its own microphone input.

That single decision drives everything else here: which machines will recognise it, how microphone gain is handled, where the volume control physically lives, and what happens when you unplug it and try the same headset on a phone or a handheld. Settle the connector and the platform first, then compare driver size, pad depth and whether the boom detaches.