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Basically your CBBE body is a big butt/big bust body type, while UNP offers a more proportionate physique.
I use CBBE in my game, but it's all a matter of preference. There are good armor mods for both body types, so you can't really go wrong with either choice.
I prefer UNP, to be honest. CBBE is a bit exaggerated for my tastes, even with the CBBE Vanilla body.
Heck, I've been thinking of just going back to plain vanilla with XCE textures.