Tethered all day and night long. Yes non tethered looks better, but is much more of a pain to use in winter. With tethered you come home, plug in the wall cable and go into your nice warm home. Depending on your mobility, takes about 1 min. Untethered- you have to get out the car, open the boot. Connect one end then the other end more work more time. Now when you are leaving the home. It’s been raining or snowing. Tethered, you unplug, wrap around the wall unit and go. Untethered you have to unlock both ends, wrap up a freezing cold or wet cable, open the boot and place back in the car. Your hands are frozen or wet. The cable is frozen or wet. It is not a nice experience for the following 3 years – especially in winter. Tethered is much more practical on a day to day basis. But I am sure in the depths of winter you will still appreciate how tidy it looks if you go untethered.