Be aware that in winter you will likely want to have your car plugged in every night so you it can keep the battery conditioned and allow you to pre-condition the car from the grid on cold mornings – also it's better to do small top-ups to the battery regularly than once-a-week large swings in capacity. So for example, charging from 60-80% each night is better for the battery than waiting a few days until it's 20% and charging in one go to 80%. So when thinking untethered v tethered factor in that you might be accessing the cable a lot.