Any pieces of mango are sweet. Doesn't need to choose. To be kind to the sellers who didn't do a high mark up.
Just don't squeeze it please. No one will take the bruised one. Not just missing a profit, but they will lose the cost too !!
Mango that they sell will be ready or not ready to be eaten straight away, they will tell. Or you just specify that when will you eat.
Also, It's a time for sweet sticky rice with mango !!
Don't miss "kao-niew-ma-muang" when you are visiting a country which has so various dishes to try !!!!!!! Even you're not a big fan of rice pudding, it's different. And “Yes” I teach this in the class.
P.S. Sticky rice is a savory carbohydrate in the North and North-Eastern Thailand, not just to be a dessert.