If you can house both adequately, do it!
They are both very good animals and I really can't pick. It depends on the day for me. Sometimes I just get blown away by the BC because he is so stealthy and calculated. It seems like a big deal when you catch a BC moving, and when you do you, you just have to watch.
When I think of snakes in the jungle, boa constrictors come to mind. You would be safe on the size front with about any male BCI, and even some male locality BCC stay lean and easy to manage.
Part of the boa pleasure IS the larger size coupled with the docile and easy to handle disposition. "Big snake,,, but not giant".
Carpets seem to be one of the ultimate display snakes based on activity, and of course colors.
You can't go wrong with either IMO.