Use the coax. The one that looks like a TV cable.
When i first got my modem installed, i got it installed in my present room. I am going to swtich rooms and want to take the modem to my room instead of wireless connection.
Which is the best way to move it, with ethernet or with the cable that comes from my ISP (the ones that looks like a cable tv cable)
I want to want to keep my speed the fastest with the move.