Guys, flat or curvy girls?

Would you like a girl who exercises a lot and has a fit body , she may have curves but she's mostly toned and on the muscular side (not super but you know the sporty type of girls) and is mostly flat (no boobs or ass)( for example Cameron Diaz or kiera knightleys body)
Or a girl who doesn't work out as much or isn't as athletic but has a somewhat skinny , more soft body with subtle curves? or even visible curves?(think Jennifer Hewitt or Beyonces body)?
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As a bonus to this question as well, which do you prefer more? boobs or ass? and give an example or link to the body type you like most.
Guys, flat or curvy girls?
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