I can share my personal experience. Since I travel a lot and often meet girls in different countries, I know where the hair is better and where it is worse.
China, Korea and Thailand. Asian women genetically have hair that is several times thicker; of course, not all Asian women have beautiful thick hair, but I often saw girls on the street with hair up to the middle of their back and below.
Unfortunately, I was not able to meet a single Asian rapuzel in person. If we talk specifically about hair, then Asians have some of the best hair, thick and silky, but not soft and fluffy enough.
I've been to India once. I personally didn’t like India at all, it’s a very dirty and poor country. Indian girls are also not very beautiful, but I often saw really long hair there. I spent the night with a Hindu woman with mid-thigh length hair and her hair was just gorgeous. The braid is approximately 16 centimeters in girth, fluffy, but slightly hard.
I was also in Russia. As everyone knows, Russia has the most beautiful girls, and I was convinced of this. You just need to go down the subway.
There is a very large abundance of beautiful girls with butt-length hair. Lots of blondes with very silky-looking hair.
I don’t even know what to say about other countries. In Europe, it is rare to see long hair, especially in the capitals.
What about Africans, they lost the genetic lottery, hair is the worst of all.
My personal top:
1 European/Asian
2 Indian
3 African