If all things were equal I would defer to the woman with more curves as my experience has been that those who lack inevitably complain more than those that have. Granted by only a tiny bit. There is so much emphasis placed on breasts in the western world that the concept of the "incomplete woman" is a comment you hear regularly from the flat chested. Luckily that attitude has started to wane as women have been able to define themselves in ways other than the physical.
"If you at least have some breasts you have some other distractions and it does not have to be all about your vagina." ~ anonymous quote
The attached image are of sisters, age 28 and 31.