It's not either or, but how much of either. I've ridden in winds well over 30mph, and ridden in 2"/hour downpours, and both are near the threshold of tolerance. If I had to choose between either of those it would be the rain. But I'd prefer a 15mph headwind to a long ride in typical steady rain.
BTW- a big factor in how I feel about rain is the temperature. Summer rain of any volume is pretty OK, cold rain in November is miserable, even if it;s only a drizzle.
So, for me, wind vs. rain is an apples vs oranges comparison.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.