I'm not really a fan of how some boas look. Hog Island, Dumerils, Colombian etc. I don't really like their body/face shape for some reason. I have a BRB and she is utterly gorgeous, though. Long and skinny with beautiful eyes.
I think Rosy Boas are a little stubby but I like the shape of their face. Actually, their faces are super cute. I think I would have to physically handle a Dumerils or Hog Island to really know if I could ever keep one. I would save a snake like that for a reptile expo, if I ever get to go to one (damn things are almost 5 hours away from me and I don't drive). But I am going to try and go next year so I can check out the different species and hopefully handle some different Boas and Pythons.