In my case I have found USB audio to have noise and dropouts, both from the Thinkpad laptop and the USB-C dock. I tried an inexpensive USB audio dongle but had the same issues. It could be ground loops but I don't know how to isolate them at the USB level.
My scanner audio goes to: The laptop for recording, an audio mixer for my desk, and a bluetooth transmitter for the garage / portable BT speaker. The PC audio out also goes to the mixer for playback / playwith my guitars- it's my sound system also. The scanner audio is floating- that and with the wall wart power for the scanner, BT xmitter ect. I've had to put transformer audio isolation on all the audio lines. It took a bit of trial & trial again but it all works and sounds great. Nothing I did solved the noise on USB audio so I gave up on it for now. Long winded way of saying my preference is line out