I would test them on Bluetooth , the USB C option sounded better to me but are you always going to use them wired. If so buy the Clear Mg.
I don’t know about the Bathys but Focal certainly recommend a burn in period for the Clear Mg of at least 24 hrs continuous play.
My test is a series of tracks in a playlist in Roon that I know really well, its a mix of classical and rock ,eg. Mozart Queen of the Night Aria to Nivana Unplugged whatever you like and appreciate the quality of, format is irellevant