It's entirely a matter of personal preference; they are both great snakes, though entirely different (just about opposites). I would recommend finding an adult blood and an adult boa and spending some time handling them separately.
I love how stout bloods are, and they are so full of personality. If you go CB, temperament isn't going to be an issue, but they can be a handful when they want to be.
Boas are typically more laid-back and are not quite as 'fun' as bloods when it comes to handling (though young/subadult boas can be very sassy!), but it does mean that they're good hang out snakes... If I want to hang out with a pet while I work or surf the web, I usually take one of my boas. My Borneo, though a total sweetie, is a bit more high-maintenance (for lack of a better word) when it comes to handling.
I personally prefer boas, mostly because of their more arboreal tendencies and their quirky personalities. That said, I absolutely adore my Borneo and you really can't go wrong with either.
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