"Forastero" is the most widely used and covers 80-90 percent of world cocoa production.
"Criollo" beans are rarer and considered a delicacy. It is produced by a few countries because the beans are less resistant to diseases that attack cocoa - one of the largest producers of this variety is Venezuela.
'Trinity' (from Trinidad) is a cross between 'Criollo' and 'Forastero' and is considered to be of much higher quality than 'Forastero' and achieves higher yields.