My smell border
In the past, the best Durian orchard is Nonthaburi. Currently, Bangkok is expanded to still be only some of small orchard which coursed the high price of Durian from Nonthaburi. You may not believe that price of Durian Kan-Yao from Nonthaburi is more than 5,000 baht per each. Some orchard does not bring their product to buy in the market, customer takes order to reserve and take the durian at the orchard.
Now, the popular durian is from Rayong, Chanthaburi, and south of Thailand. Monthong is the most popular with dry meat and smell not so strong. We can export Durian to border country around Thailand. Japanese and Singaporean love durian so much. I would say that Durian is King of fruit. The best one has to produced from Thailand.