BCC typically come in localities - Surinam, Guyana, etc.
BCI come in morphs as mentioned above, though there are some smaller-size localities such as Sonoran and Tarahumara.

Typically the larger the snake the more chill it is, though obviously some individuals will be exceptions. The BCC in particular I've handled are very mellow, but they do get big and strong! And my three Tarahumara BCI's were hissy little things for the first 18 months of their lives.