I have been doing a lot of reading on Hoya lately, and have read the same recommendation in several different articles, and books as Cora brings up.
I have potted one of my hoya in terracotta, and two in plastic. All are doing well, I do water the one in terracotta more. but I think the plant appreciates drying out so quickly too. For those who tend to overwater, the terracotta would probably be helpful.
