We have one BP and I am very interested in expanding our collection (Don't tell my husband I call it that!). I held a Rosy Boa and fell in love. But I am also very interested in KSB's. Can anyone give me a low down on which I should choose?

This is what I am currently thinking:
Rosy: Almost always VERY docile, beautiful, more affordable, low humidity requirements, moderately active (a + for me).

KSB: Mostly docile but can have a miss, even MORE beautiful, a male only requires a 10 gal tank at full size, not very active a (- for me).

Please, correct me if any of my facts are wrong. And add any pertinent details I should consider. THANKS!