I say headwind! I like riding into the wind,even when we have the Santa Ana winds blowing at 30 with gusts up to 60 mph. Of course climbing some makes you stronger so heading into the wind is almost like climbing to me but without the gravity disadvantage
Plus I know most riders hate the wind so that gives me an advantage being a wind rider.
Funnies wind story I ever experienced. Gina and I did a century ride in Brawley (near Salton Sea, desert area). Wide open fields and pretty flat. We were riding our steel Burley Duet tandem. It was pretty windy the first 10 miles. At 20 miles, man it was blowing like crazy! We caught up to another tandem couple on a high end Santana (we couldn't afford one) with really nice aero wheels. Well since we caught up, I guess they felt they had to compete with us having a BETTER tandem. I say that out of sarcasm because of what they said next.
We would catch up then they would sprint off. I'm smart enough to know if you're at 20 miles of a 100, you don't blow your wad trying to show off the bike's abilities.
But we continued to roll up on them several times and each time they felt the need to show some speed. We kept our pace. About 30 miles into the ride, we rolled up along their side. The lady asked what kind of tandem we had. Oh, it's a Burley.
She said, "you should save up your money and invest in a good tandem. We did and bought our Santana. Then we bought some better faster wheels for it. They are fast and make a big difference!", she said. Wow, that is a nice bike I told her, it was, I was jealous!
But 50 miles in, it got super windy, like 60 mph gusts. It was murder for the next 15 miles but we toughed it out. I've done about 35 centuries and never given up. I don't quit unless someone shoots me!
It was tough but we kept going. Left the other tandem behind. Lost track of them and their fancy wheels. At that point, I had to laugh! I don't diss other riders but if you boast about your super bike, you better show me something.
So we finished the ride, never saw them again that day. But at night, we went to the local restaurant, not many out there so only one nice place to dine. We ran into them. I mentioned the strength of the wind and told them congrats for completing a though flat, a tough windy ride.
"Oh, we didn't finish. We dropped out about mile 50!".
Oh, OK! No, I did not laugh in their faces, but I laughed about their expensive super fast super light bike and wheels.