I have a pair of adult Brazilian Rainbow boas as well as one that's about two years old now. I also have a few BCI's.
The BRB's are slender boas and while they top out around six feet, they stay thinner than the BCI's. Males are even thinner than females if weight is an issue. At six feet my BCI female was much thicker than either BRB, and she wasn't at all fat.
As was pointed out BRB's are a bit more difficult to keep due to their humidity needs - an appropriate enclosure is required. Once set up though I've found all 3 of mine are a joy to keep. They are not at all nippy, are more inclined to just hang on you rather than try to escape/hide when handled, and they are intensely curious. Oh, they also like investigating long hair.
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