<p>The shorter one will be more useful. You might want the longer one a few really cold days but the rest it will be too much. Much easier to add a layer plus good earmuffs or other headwarmers. And don’t go by the first cold day. You do get much more used to it and after a few weeks 20 will feel comfortable and 40 will be T-shirt weather. It’s a cold below 0 wind that really hurts. That’s only a few days a year. I learned to avoid open spots and cut through warm buildings.</p>