I have only tried alternate-day fasting, so I can't really say with confidence. That being said, I think that I would have trouble keeping to the 1pm - 6pm eating window - I have tried going without breakfast on a fasting day, and did not enjoy it at all. Also, eating only between 1pm-6pm every day sounds much more unpleasant to me than not eating every second day, although this might just be an illusion on my part.