a PCI or PCI-E sound card would most likely give better sound quality with less CPU utilization than USB, not to mention it helps prevent having another "thing" hanging off your computer.
In general, USB sound devices should only be used when necessary like in a laptop or computer w/o an available expansion slot.
internal PCI and PCI-E cards can get more power from the bus than standard USB 2, or 3.
More power = bigger processor(in good sound cards).
A USB device will take more CPU cycles. A USB 2 sound card could be bandwidth constrained, but a USB 3 sound card would not have bandwidth issues.
Again, the promise of USB 3 proves thwarted
--fabricators prove glacially slow to adopt USB 3--forcibly, they still insist that you stick with USB 2.
(USB 2 really isn't very good with media--it's best intended for relatively simple input devices such as mice and keyboards
--USB 2 dongle devices are pretty simple too, though. Sound should prove satisfactory, if limited, for your purposes here.)
https://superuser.com/questions/1034732/pci-sound-card-vs-usb-sound-card.