Good responses above.
There really isn't anything else to consider if you are NOT breeding. IF you ARE, a female may exhibit some nasty behavior when gravid or fresh after giving birth. Otherwise what the others have said holds true. Feeding mistakes, or scared/defensive behavior due to caging, husbandry or newly acquired/unsettled animals.
As far as a "pet" you would be fine with either. Males can attain the same size as females if you do not have any other female boas in the home giving of pheromonal cues which would signal breeding behavior and loss of appetite.
Husbandry and feeding frequency play the biggest roles in the growth rate of your BC.
This is my male.
I don't get tired of showing him off. He is a Gus Rentfro bred, Barranquilla, Colombian, pure locality boa.
http://i772.photobucket.com/albums/y...a/IMG_3176.jpg
He will hit 4 years old late June and he is 6 feet long on the dot.
After learning a great deal about boas over the years, I feel I probably overfed him to a certain extent when he was younger. Now I feed him once a month in the summer and not at all over the winter months.
If he lives 20 - 40 years I'm sure he will make 7 feet.
In general BCI are very hardy, more forgiving of husbandry and feeding mistakes than BCC and also are said to be more docile. These statements are "general" and a great deal of BCC are becoming equally easy to care for and handle because of captive breeding and better understanding of their requirements.
If you are getting back into boas, get what tickles your fancy the most. Giants are not the norm within either species and there are very successful keepers of both BCC and BCI.
