I recall a conversation many years ago, discussing this for a time trial. The conclusion was that it's better to have a tail wind going out, then you get used to riding at a high cadence and get really warmed up for the ride back into the headwind. A head wind to the turn, just makes you sluggish and grinding a high gear. Something that is difficult to make up in spite of a tail wind back.true, i always prefer the headwind on the way out!