The key difference between Saigon and Korintje Cinnamon is the flavor profile and where the plant is grown in the world. Vietnamese cinnamon (Saigon) is harvested in a very similar way as the Indonesian (Korintje) variety. Sheets of bark are stripped from the base of the tree, cleaned with a knife, and dried in the sun.
Saigon has a hot and sweet cinnamon flavor because of the high oil content in the bark. At one point, it was very challenging to find in the United States. You can often find Saigon cinnamon in baked dishes where cinnamon is the star, like cinnamon rolls.
Korintje cinnamon is also known as Cassia Cinnamon and is grown in Indonesia. The well-known, dependable flavor is bittersweet and similar to what you might find in cinnamon candies.