Print quality v sd card

On Facebook there is assertion that print quality from USB is reduced compared to printing direct from sd card:-

“ [Printing from SD Card] ... This honestly is the best way. Printing tethered via USB will reduce your print quality, introducing random artifacts, slow the print down and cause random failures”.

The poster asserts that there is much evidence to support this on this forum but so far I haven’t found it.

Can anyone point me to any definitive info please?

Hello @Uncle_Paul!

This topic is intensely discussed here: The ongoing USB Conspiracy Theory?

Thank you!