Versus: skinny vs. curvey

Skinny or curvey? There are women in the world such as beyonce who have thick muscular curves who are specifically known for said curves. They're known to be beautiful but with that in mind, why do women such as Stephanie Naumoska  become Miss Australia, or models? Why do women strive to be skinny, instead of healthy and muscular/toned?

When the idea gets put into womens head that they should be skinny, they dont think skinny in the sense that they're healthy and lean, they think as skinny as they can get which is often an unhealthy weight. Some of this, comes from men, who think skinny women are sexier. Some of this comes from the media, and others are unknown. More and more women are becoming unhealthily skinny, is this going to stop or are more and more going to continue to become this way?

How do you think women should look? Skinny, or curvey?