

Whilst Cassia is deeper, spicier (but with a far less complex aroma) and is most likely the one that you associate with the taste of cinnamon, due to its use in many everyday products, from cinnamon buns and rolls to syrups and ciders. Its sticks are more reddish, far tougher and thicker, with only one or two layers.

https://thelosttikilounge.com/ingredients/cinnamon-syrup-guide/